I thought this only happens in movies

Caitlin: Eeew, there's a yucky bamboo!
Me: Where?
C: In the garbage.
M: Oh, I see.
C: Why is it in there?
M: Because, it did't get enough water, got yellow, and died.
C: Why?
M: Because mommy didn't water it enough.
C: Why?
M: Because she forgot.
C: Why?
M: Because she does that sometimes.
C: Why?
M: Umm...because.
C: Why?
M: There is no because. It just happens.
C: Why?
M: Caitlin, sometimes there isn't a why.
C: Why?
M: *sigh*
C: *mischevious grin*