Hummer

I have this annoying habit of humming constantly and I'm not really even aware of it.

So today I'm on the phone with someone who says he works in a railroad yard and a few minutes into the call I catch myself, yep, humming "I've Been Working on the Railroad." Still humming it, in fact.

My default song is the theme from the Meow Mix commercial. Whenever someone complains about having a song stuck in their head I taunt them with mine.