http://www.youtube.com/watch?v=kF3L359yKjs&feature=related
Banas are proof that God exists gaiz.
This one's so old and fallacious it's not even funny─sad thing is, people still
do use it as proof for a God(along with Pascals Wager and Goedel's Incompleteness Theorem─both of which are equally based on false presumptions, but that's a story for another day). That's not to say there aren't as puerile arguments on the atheism side of things─there are: "If God could create a rock so heavy that even he couldn't lift it, he isn't all-powerful─and if he could he isn't omnipotent."(again, I'm not going to get in too deep) The point is that every argument you'll ever come across begs the question of if God does or does not exist, said and unsaid loosely based arguments back up one's point. I suppose I am assuming that new, more legitimate arguments won't become available; however, I'll gladly concede my point if any do.
Oh and here's a sample wiki(there's a better one, but I can't seem to find it) using simple deductive logic to debunk the banana "paradox":
http://wiki.ironchariots.org/index.php?title=Banana_argument