Riddles can be of a wide variety of subjects. But remember, even if one knows the answer to a riddle it's not for them. All riddles are expressly meant for the Batman.
This is one commonOne: Q. A man road into town on a Friday stayed three days and came back on Friday! How did he do it?
A. The Horses name was Friday :)
The most common question asked is "Can I ask you a Question?" well, i dont think there is on,:D (I'm a different person) I think the most common question asked is probably, "why?" No your wrong there...