For centuries, magicians have pulled eggs out of their mouths, and while it's a silly gag on the surface, there's some profound symbolism that has made the trick a classic.  When a magician pulls an egg from his mouth, he transforms his mouth into a vagina (or cunt, as some prefer to call it).  Eggs are, of course, part of the female reproductive process.  The unspoken meaning to the trick is that if a magician can transcend gender, he can transcend anything (i.e. be all-powerful).  So if you shove a banana up your butt (or bunghole, as some prefer to call it), you are performing a magic trick, too.  You are transforming your anus into a mouth, and that's pretty damned impressive.  And so we say: keep the magic alive and continue shoving food up your ass.