Cynicism in ignorant people. At least know what you're talking about, please.
The thought of someone turning out to be two-faced and just somehow screwing up something that involves me, just to get that satisfaction that they had me.
Meeting someone too optimistic. I'm not pessimistic, I'm a realist with optimistic ideals. I want stuff to go well, I just can't say things always will.
Choking and or suffocating on something DELICIOUS. Like if you ate a lot of caramel and it clogged your traqchea somehow. Sweet, but terrible death.
Ridiculous people. IE: Attentionwhors, otherwise known as Dramaqueens, I also dislike Personality Shapeshifters. Often two faced, they change their personality on a dime, as if casting a glove off and fastening a different one one to fit many situations.