Best/Worst "This guy is doing a bit" encounters?

What are some of those people whose intentionally abnormal behavior just kind of sticks with you?

For example, I remember once playing VSH, this one person named "2004 Toyota Corolla" (or something like that) would play real engine noises over VC while playing as Hale. Never used the mic for anything else.

Another time, three soldiers on my team were all moving and fighting together and all of them would always stop to taunt whenever any single one of them got a kill. I didn't like it while it was happening but now it's a funny memory.