Here's one my son told us recently. Not sure which book he got it from ...
Three blondes went to an IQ specialist to have their intelligence measured.
The specialist asked the first man, "What is 3 + 3?"
The man answered, "Friday."
The specialist moved on to the second man and asked him, "What is 3 + 3?"
The second man answered, "465."
The specialist sighed and moved over to the third man, and again asked, "What is 3 + 3?"
The man sat quietly for a minute and then finally answered, "6."
The specialist looked shocked and said, "How did you know that?"
And the third man said, "Easy, I just subtracted 465 from Friday."