Besides the squeakers it would have to be the domination sound, it reminds me of the fact that someone is better than me which is fine considering that someone will always be better than you, however the system is constantly rubbing that fact in my face and it's annoying, and in a way it detains me from actually working with my team and instead I start focusing on my nemesis more, though I try my best to keep team priorities first. (same goes with any other nemesis system in games with or without sound) But that's my opinion considering that I can get more easily frustrated than some people which doesn't help ;-; .