Answer:
I am used when you jump off a bridge for fun.
I go through a door but never go in, and never come out. What am I?
If two is company and three is a crowd, what is four and five?
You walk into a room with a rabbit holding a carrot, a pig eating slop, and a chimp holding a banana. Who is the smartest animal in the room?
I twist and turn and leave a loop. What am I?
What is yours but only used by others?