It's also a bodily organ, the function of which I do not know ^_^

I think its where excrement is stored before it is catapulted through the anus.

I like the question mark...

Cause with it..you can turn anything into a question..

a colon? instead of a colon..which suggests something..

Lovely >_<

It's a toss-up between the exclamation and the question marks, great on their own but even better together :)

Interrobang!

http://www.paratype.com/pictures/help/term/180.gif

This is basically an exclamation and question mark together as one, used for asking rhetorical questions.