When is a door not a door?
When is 99 more than 100?
How many times can you subtract 10 from 100?
What always works with something in its eye?
XQQQME, What does it mean?
What asks but never answers?
Three doctors said that Robert was their brother. Robert said he had no brothers. Who is lying?
What belongs to you but others use it more than you do?
What can you catch but not throw?
I am full of holes but still holds water. What am I?