Why do people laugh when somebody fall down????

I Laugh at this when i saw this quesion. Cause u really don't know when that person falls u will laugh yor a** off LMAOOOOO!!!!!!!!!!!!!!!!!!!!! I want to fall now *Falls off stairs* AHHHHHH IM HURT. Can someone help me???!!!

i don't know either i guess because its kinda unexpected i don't laugh unless the person who fell is laughing because i think its super rude for someone to laugh at someone who is hurt. someone who got hurt is not funny and people who laugh at that are just sick in my opinion

Cause its funny. Its unexpected

cuz its kinda funny, and u never know when its gonna happen, lol
i think its funnier when it happens to one of the cute guys at my school, लोल

well bout me i dont laugh..i laugh bout my self when i fall