Tell them here. I'm curious.
On top of my list:
When a guard catches me with I an inventory full of stolen stuff. Chances of getting away from guards are low. I get killed. All stolen stuff gone. All work for nothing. Pisses me off.
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When a Templar keeps on healing in pvp when I am about to beat them or when I get tea bagged after someone beats me by teaming up when that is just someone being too scared to 1v1.