I've been paying attention and we hit mute on the Dell "lollipop song" (it was cute the first 3 times and hit annoying soon after), the Kitkat where everybody crunches to the "give me a break...." theme. There is a new KFC commercial that has to do with crunchy chicken that gets the mute button and pretty much any Carl's Jr spot - I find them simply nasty.
One that annoys me but makes me laugh out loud: Colon Flow. No thanks - ROFL!