the-deadly-cutsman
my favorite sfm/ gmod animation thing

when a character turns their head and you hear bones cracking 

adeptus-sororitas-official

Also really good

Person doesn’t want to animate walking, so they either have the characters slide on the ground while or just fucking fling them into the shot

gensokyododgeman

Other fun ones:
-Sliding along the walls/ceiling when a spot can’t be accessed by walking
-N64 music is constantly lurking around
-When a character slaps another character or object and it goes flying somehow
-Ed Edd and Eddy sound effects

twentyeight-stabwounds

-When an upright character moves into a shot but their legs are still subject to ragdoll physics so even though their torso has stopped moving, their legs are jiggling wildly

mechabekahscakery

the squelch sound that’s commonly used now for when the model blinks

random sniff

character models being perfectly still while moving from point A to point B with heavy metallic straining noise occurring