I love these sorts of puzzles: try and figure this out:
Two sons and two fathers go fishing. Each one catches a fish. They return from their fishing trip with a grand total of three fish. How does this work?
h/t to Jeffery Deaver - answers in the comments, or on the back of a $100 bill to me.
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One of the daddies throw one of the catched fish because it's too small?
Surprised that no one tried this over them last five weeks, but there you go.
The answer: there are only three people there, thus each one caught a fish. A man with his father and [I]his[/I] father (son, father, grandfather) so, two sons and two fathers; three people.