Rarely but occasionally someone keys the mic on the wrong freq. Unintentional, and it's worth a collateral laugh. I don't mind playoff scores personally, although you can just get that from center.
The meowing is just stooopid. It was funny for about a wek after Super Troopers was released, but that was a good while ago
The most annoying thing is the "on guard"s, because those idiots do it when people are actually using guard for it's purpose, getting someone back on their freq or an actual emergency. I have actually heard, on two occasions, emergency GA aircraft in serious distress and people trying to help them getting stomped all over by "guard nazis".
I'm certain 90% of the "guard nazis" are doing it to make people *think* someone is being anal, it cannot possibly all be DL.
There are several things I like about flying in the west and not having to listen to that crap is one of them.