Pet Peeve - Which is more annoying?

As a techie in a caged office, a.k.a. cubicle, which do you think is more annoying?

1. You get to listen to all of your neighbors cell phone's ring tones. IMO, the most popular one seems to be the Nokia one!
Or,
2. The annoying , irritating, "tring tring" tone of an instant messenger. The winner seems to be Yahoo here.