Answer:
There is a dog on one side of a lake and a woman on the other. The woman calls the dog over and when he gets there he is not wet at all. How is this possible?
You have a bucket full with 5 gallons of water. What can you ADD to it in order to make it 3 gallons?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
What is yours but only used by others?
Why can't Kevin, who is now living in Canada, not be buried in the USA?
I only exist when you are here. Where you never were I can never be.