Here's a few things that grind my gears:

-Shallow people

-Reality television shows. Drawn Together is the only good one.

-People who cheat on their significant others and still claim they love them.

-People who think they are better than you because of looks or money. Get over yourselves you damn narcissists.

-People that think they are right about everything, even when you have proof that they are wrong. I have a friend who thinks he is right about everything he thinks he knows about drugs, and he hasn't done any research. He doesn't want to listen to what others who have done the research are saying.

-Religious extremists. 'Nuff said.

-Christians who base their drug use on the bible and then say that smoking cannabis is wrong. What fucking ignorance.

Well, if I think of any others, I'll post them later.