COP: Are you high?
ME: If I was high, could I do this? *walks in a perfectly straight line*
COP: Wth he just walked off a cliff.
COP: Are you high?
ME: If I was high, could I do this? *walks in a perfectly straight line*
COP: Wth he just walked off a cliff.
Okay, muffin, listen up! You seem like the kinda person who thinks a straight line is a complex geometric concept. The joke plays on the cop's assumption. The person pretends to prove their sobriety by walking a straight line. But they walk straight off a cliff. It's funny because it's unexpected and ridiculous. It's a play on what 'straight line' can actually mean.