diff --git a/code/datums/brain_damage/severe.dm b/code/datums/brain_damage/severe.dm
index 9a603b4abe8..d7e9aec71db 100644
--- a/code/datums/brain_damage/severe.dm
+++ b/code/datums/brain_damage/severe.dm
@@ -218,6 +218,9 @@
 				else
 					to_chat(owner, span_userdanger("You feel your heart lurching in your chest..."))
 					owner.adjustOxyLoss(8)
+		else
+			//No effect
+			return
 
 /datum/brain_trauma/severe/discoordination
 	name = "Discoordination"
diff --git a/code/datums/components/singularity.dm b/code/datums/components/singularity.dm
index 04d5690d733..0eea5a8b2da 100644
--- a/code/datums/components/singularity.dm
+++ b/code/datums/components/singularity.dm
@@ -294,10 +294,10 @@
 	var/dir2
 	var/dir3
 	switch (direction)
-		if (NORTH || SOUTH)
+		if (NORTH, SOUTH)
 			dir2 = EAST
 			dir3 = WEST
-		if (EAST || WEST)
+		if (EAST, WEST)
 			dir2 = NORTH
 			dir3 = SOUTH
 	var/turf/farthest_perpendicular_turf = farthest_turf
diff --git a/code/game/machinery/requests_console.dm b/code/game/machinery/requests_console.dm
index e9e87c41424..9a54c48af21 100644
--- a/code/game/machinery/requests_console.dm
+++ b/code/game/machinery/requests_console.dm
@@ -313,7 +313,7 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/machinery/requests_console, 30)
 				radio_freq = FREQ_ENGINEERING
 			if("security")
 				radio_freq = FREQ_SECURITY
-			if("cargobay" || "mining")
+			if("cargobay", "mining")
 				radio_freq = FREQ_SUPPLY
 
 		var/datum/signal/subspace/messaging/rc/signal = new(src, list(
diff --git a/code/modules/hydroponics/hydroponics_chemreact.dm b/code/modules/hydroponics/hydroponics_chemreact.dm
index 99e5f65126a..c9cf3ce8606 100644
--- a/code/modules/hydroponics/hydroponics_chemreact.dm
+++ b/code/modules/hydroponics/hydroponics_chemreact.dm
@@ -27,6 +27,6 @@
 		if(11 to 20)
 			mutateweed()
 			return
-		if(1 to 10)
+		if(0 to 10)
 			mutatepest(user)
 			return
diff --git a/code/modules/mob/mob_helpers.dm b/code/modules/mob/mob_helpers.dm
index 047e6926f3a..3fe3dc9dace 100644
--- a/code/modules/mob/mob_helpers.dm
+++ b/code/modules/mob/mob_helpers.dm
@@ -83,7 +83,7 @@
 	var/rawchar = ""
 	for(var/i = 1, i <= leng, i += length(rawchar))
 		rawchar = newletter = phrase[i]
-		if(rand(1, 3) == 3)
+		if(prob(33))
 			var/lowerletter = lowertext(newletter)
 			if(lowerletter == "o")
 				newletter = "u"
@@ -95,18 +95,19 @@
 				newletter = "oo"
 			else if(lowerletter == "c")
 				newletter = "k"
-		if(rand(1, 20) == 20)
+		if(prob(5))
 			if(newletter == " ")
 				newletter = "...huuuhhh..."
 			else if(newletter == ".")
 				newletter = " *BURP*."
-		switch(rand(1, 20))
-			if(1)
-				newletter += "'"
-			if(10)
-				newletter += "[newletter]"
-			if(20)
-				newletter += "[newletter][newletter]"
+		if(prob(15))
+			switch(rand(1,3))
+				if(1)
+					newletter += "'"
+				if(2)
+					newletter += "[newletter]"
+				if(3)
+					newletter += "[newletter][newletter]"
 		. += "[newletter]"
 	return sanitize(.)
 
@@ -119,7 +120,7 @@
 	var/rawchar = ""
 	for(var/i = 1, i <= leng, i += length(rawchar))
 		rawchar = newletter = phrase[i]
-		if(rand(1, 2) == 2)
+		if(prob(50))
 			var/lowerletter = lowertext(newletter)
 			if(lowerletter == "o")
 				newletter = "u"
@@ -133,23 +134,24 @@
 				newletter = " NAR "
 			else if(lowerletter == "s")
 				newletter = " SIE "
-		if(rand(1, 4) == 4)
+		if(prob(25))
 			if(newletter == " ")
 				newletter = " no hope... "
 			else if(newletter == "H")
 				newletter = " IT COMES... "
 
-		switch(rand(1, 15))
-			if(1)
-				newletter = "'"
-			if(2)
-				newletter += "agn"
-			if(3)
-				newletter = "fth"
-			if(4)
-				newletter = "nglu"
-			if(5)
-				newletter = "glor"
+		if(prob(33))
+			switch(rand(1, 5))
+				if(1)
+					newletter = "'"
+				if(2)
+					newletter += "agn"
+				if(3)
+					newletter = "fth"
+				if(4)
+					newletter = "nglu"
+				if(5)
+					newletter = "glor"
 		. += newletter
 	return sanitize(.)
 
diff --git a/code/modules/power/singularity/singularity.dm b/code/modules/power/singularity/singularity.dm
index feb309ce0cf..16253e11401 100644
--- a/code/modules/power/singularity/singularity.dm
+++ b/code/modules/power/singularity/singularity.dm
@@ -335,10 +335,10 @@
 	var/dir2 = 0
 	var/dir3 = 0
 	switch(direction)
-		if(NORTH||SOUTH)
+		if(NORTH, SOUTH)
 			dir2 = 4
 			dir3 = 8
-		if(EAST||WEST)
+		if(EAST, WEST)
 			dir2 = 1
 			dir3 = 2
 	var/turf/other_turf = considered_turf
diff --git a/code/modules/ruins/lavalandruin_code/elephantgraveyard.dm b/code/modules/ruins/lavalandruin_code/elephantgraveyard.dm
index f868504a626..5d75a8f66c4 100644
--- a/code/modules/ruins/lavalandruin_code/elephantgraveyard.dm
+++ b/code/modules/ruins/lavalandruin_code/elephantgraveyard.dm
@@ -157,6 +157,9 @@
 		if(7)
 			new /obj/item/clothing/glasses/sunglasses(src)
 			new /obj/item/clothing/mask/cigarette/rollie(src)
+		else
+			//empty grave
+			return
 
 /obj/structure/closet/crate/grave/open(mob/living/user, obj/item/S, force = FALSE)
 	if(!opened)
diff --git a/code/modules/surgery/advanced/lobotomy.dm b/code/modules/surgery/advanced/lobotomy.dm
index 02a8bde5def..d5e22198901 100644
--- a/code/modules/surgery/advanced/lobotomy.dm
+++ b/code/modules/surgery/advanced/lobotomy.dm
@@ -51,16 +51,17 @@
 	target.cure_all_traumas(TRAUMA_RESILIENCE_LOBOTOMY)
 	if(target.mind && target.mind.has_antag_datum(/datum/antagonist/brainwashed))
 		target.mind.remove_antag_datum(/datum/antagonist/brainwashed)
-	switch(rand(1,4))//Now let's see what hopefully-not-important part of the brain we cut off
-		if(1)
-			target.gain_trauma_type(BRAIN_TRAUMA_MILD, TRAUMA_RESILIENCE_MAGIC)
-		if(2)
-			if(HAS_TRAIT(target, TRAIT_SPECIAL_TRAUMA_BOOST) && prob(50))
+	if(prob(75)) // 75% chance to get a trauma from this
+		switch(rand(1,3))//Now let's see what hopefully-not-important part of the brain we cut off
+			if(1)
+				target.gain_trauma_type(BRAIN_TRAUMA_MILD, TRAUMA_RESILIENCE_MAGIC)
+			if(2)
+				if(HAS_TRAIT(target, TRAIT_SPECIAL_TRAUMA_BOOST) && prob(50))
+					target.gain_trauma_type(BRAIN_TRAUMA_SPECIAL, TRAUMA_RESILIENCE_MAGIC)
+				else
+					target.gain_trauma_type(BRAIN_TRAUMA_SEVERE, TRAUMA_RESILIENCE_MAGIC)
+			if(3)
 				target.gain_trauma_type(BRAIN_TRAUMA_SPECIAL, TRAUMA_RESILIENCE_MAGIC)
-			else
-				target.gain_trauma_type(BRAIN_TRAUMA_SEVERE, TRAUMA_RESILIENCE_MAGIC)
-		if(3)
-			target.gain_trauma_type(BRAIN_TRAUMA_SPECIAL, TRAUMA_RESILIENCE_MAGIC)
 	return ..()
 
 /datum/surgery_step/lobotomize/failure(mob/user, mob/living/carbon/target, target_zone, obj/item/tool, datum/surgery/surgery)
diff --git a/code/modules/vending/_vending.dm b/code/modules/vending/_vending.dm
index c4448fc798e..16918e08ab4 100644
--- a/code/modules/vending/_vending.dm
+++ b/code/modules/vending/_vending.dm
@@ -504,6 +504,8 @@ GLOBAL_LIST_EMPTY(vending_products)
 					freebie(user, 2)
 				if(16 to 25)
 					freebie(user, 1)
+				if(26 to 75)
+					return
 				if(76 to 90)
 					tilt(user)
 				if(91 to 100)