Hmmm lets see...
Hackers,
Steam Prices,(overpriced sometimes)
When your driving, another person who's in the other lane looks at you and speeds up and gets in front of you-.-,
people who say chuck norris jokes, your mom, your face, etc.
people who say things from a movie when they say they thought of it
spammers, flamers, trolls, etc.
Macs