1.) Picking Eve/Shaco/etc.
2.) Contesting enemy buffs vs. Lee/Udyr/etc. at level 2~3
3.) Giving FB to them and their laners who - believe it or not - are closer to their own side of the jungle than friendly laners, particularly when you didn't let them know you were doing this in the first place via pings or any other form of communication, and
4.) Blaming your teammates for the loss and going AFK.
PSA from many salty ranked losses. Thank you.