I have the same feelings regarding the "how are you?" greeting. 90% of the time the person asking couldn't care less. Depending on my mood, I may respond with "not well, I have hemorrhoids" or something similar.

I have one particular pet peeve that is definitely at the top of my list. It is when someone uses all the TP and doesn't bother to put a new roll on. I make sure to give them instructions on how to put a new roll on in a manor that will never forget.