What are some things you've done in premades to screw with your friends, be they in bot games or actual PvP?

In my case, I was playing a beginner bot game with two other friends on TT as Lux. They were going to go get Vilemaw and I was on bot lane, so I told them to wait for me because I wanted to fight him too, but they went on ahead, so I went all the way over there anyway, attacked Miss Fortune and Warwick, then went to Vilemaw where my teammates were still fighting to have Miss Fortune fire her E while Warwick attacked them. Our team got the buff without dying, but I couldn't stop laughing.

I like trolling with my friends... As in getting a premade of four players, going into blind pick. As our teams about to win everyone in my premade surrenders. Pisses off scrandy randys all the time.

I play as Soraka and ult only after they die