My uncle Menachem is visiting from Israel with my Aunt Nechama and their baby Dovi. Menachem is something of a clown and drives everyone crazy sometimes. We were at my mom's house today and so got to see them.
Menachem to Mordechai: How old are you now?
Menachem: How long did it take you to become six?
Mordechai: Two years.
Menachem: Two years? How do you figure that?
Mordechai: Well, the last time you were here I was four!
(How he remebered that Menachem was here about two years ago is beyond me.)