Most triggering things your teammates do?

I was curious what do you think are the most triggering things your teammates can do? It can be anything, a play they make, a thing they say, a hero they pick or an item they buy for example. I’ll start with few:

* Pick weakest and most passive carry hero available and blame your teammates for the rest of the game after losing the lane.
* Don’t take advantage of last pick. You have last pick, you see your 2 other cores are PL and Alchemist. You proceed to pick mid Medusa and wonder why you lost the game in 20 minutes because your team had 0 stuns and 0 cores playing the map.
* Refuse to buy BKB when you have 10k more gold than enemy core and die to stunlock every fight.