Got a couple to bump:
What comes once in a minute, twice in a moment, but never in a thousand years?
I reach for the sky, but clutch to the ground; sometimes I leave, but I am always around. What am I?
What belongs to you but others use it more than you do?
You throw away the outside and cook the inside. Then you eat the outside and throw away the inside. What is it?
You die and go to a completely white room. This room is white, and in it there are 2 doors (one door leads to heaven, one leads to hell.) In the center of the room there are identical twins. They look, act, and speak exactly the same. The only difference is, one always lies, the other always speaks the truth.
Rule:
You only have one question that you may ask, after you ask that question you must walk through one of the two doors.
Here is the riddle:
What is the one question you ask to find out which door is which?