Whenever I'm rushing around trying to do several things at once I find myself singing "Ai, yi, yi, yi! I am the Frito Bandito" over and over. Just that single line from the commercial as I can't remember the rest. I also can't remember when I developed this habit (I don't recall doing it when I was in college), but I am certain I've been doing it for at least the past decade.
If you haven't seen the commercial or you now have a hankering to see it again, check out