My triggers are "flotilla," "cotton," and "Craftmatic."  When I hear any two of them in the same conversation, I cut up all of the mammals in the room and have to start over in a new town.  I suspect that these are conditioned responses, though.

When someone says "evolution is only a theory" I feel like ripping their head off.  I felt that way even when I still believed in god.  I think I usually just start sweating and babbling incoherently while my eyes roll back into my head.

I get totally pissed when people insist that Hitler was an atheist.  It is apparently extremely difficult for people to realize that atheism isn't a political ideology.   

Godwins in general really get my goat. 

Just a list.

1. I've experienced God!

2. I'm in a personal relationship with God!

3. The Bible never contradicts itself!

4. Evolution is a lie!

5. Evolution is a  only a theory!

6. Evolution was created by Satan!

7. You have no proof that God isn't real so you must believe in him!

8. You're going to Hell!

I get pissed when people refer to evolution as a lie but I would say that when people are conversing and they speak of events in the bible as literal events and they compare them to event's going on in their lives. For exampe I heard one of my Christian friends who is a girl the other day complaining about her pains during pregnancy. She said " Ughh I wish having a baby was easier, But eve had to go and screw it all up for the rest of us." I hate that kind of thinking. I hate that this nonsense is so ingrained in the minds of people that they would say something so stupid. I also hate when they use pascals wager.

1. America was found on christianity/we are a christian nation.

2. You can't prove there is no god.

3. So you're agnostic?

4. Did you know X person was X?

5. anything close to pascal's wager

Man, I'm shocked it took us this far down to hit Pascal's wager.

personally #s 1,2, & 5 from your list are the ones that boil my blood more than anything. 

Yeah the lack of morality thing drives me nuts too.   Some variation on "well without god, how would we know right or wrong?" or "If I didn't have Jesus, I'd probably just murder you!"  (EEK)

 Apparently I retain the moral high ground, because I've got no Jesus and I have no desire to kill people.  

One good response I'd heard to this, and apologize that I forget the source.  I think it was a guest on one of the Infidel Guy network shows or maybe Dan Barker's show.   But he said when people ask him "How do you raise your kids to be moral without god?"  He replies with something like "It's just like teaching a child to be moral without a purple shirt."

"It takes more faith to be an atheist."

"America was founded on christianity/we are a christian nation," might be number 1 for me as well.

Hitler was an atheist or Nazi Germany was atheistic is another one that ranks right up there.

Having someone say; "God bless you" if you do something nice for them is one I don't think anyone has covered yet.  That one bothers me because I understand they may just be trying to be polite, but I rarely let it pass without saying, "I don't believe in that nonsense."  I rarely get much of a come-back to that.

"But there are so many good people who have done so many good things because they were Christians!"

That one boils my blood.

"But he died for you."

Would you do this parked in handicapped spaces?

While handicapped people make handicapped faces? 

You can't find evidence of god because you aren't looking hard enough.

You can't find evidence of god because you need to open your heart and accept Jesus.

You can't find evidence of god because you refuse to open your eyes and see the Truth (with a capital T, mother fuckers)

You can't find evidence of god because Satan has hidden the Truth from you. Open your eyes and see the Truth, man!!!!

Actually, any time anyone capitalizes Truth, Love, Real, etc., as if that somehow legitimizes or solidifies their argument should be taken outside and curbed. End of story.

See, I'm just mad now thinking about it. I need a glass of wine...

That's right, I'm angry because I'm an atheist!!!

[Edit - to throw my two sense in one more time] 

I also HATE when someone says: "There is an empty tomb in Jerusalem,so that proves Jesus is alive".

And these are just the common ones! I envy Brian and Kelly's restraint for not leaping across the stage at kirk cameron's crocoduck photoshops. That might have made me pass out, like an ignorance overload.

I hate the frequent claim by theists that all atheists really do believe in God, deep down inside, and are just denying it.  I generally don't even bother trying to talk to a theist once they play that card, because what's the point?  If they're operating under the assumption that I already agree with them, and I'm just pretending not to, it's impossible to engage in honest, respectful debate.

I mean, I could just as easily say that deep down inside, theists don't really believe in god.  An invisible man in the sky who watches us masturbate?  That's utterly absurd, and they know it as well as I do.  Honestly, I often suspect that very thing, but I would never use it as a debate tactic.  Within the context of a respectful conversation, I'm willing to extend them the courtesy of taking them at their word in terms of their stated belief in God, even though I have trouble understanding how any reasonably intelligent human being could possibly believe such silliness.

"I won't date you because your atheist!!"

Joking, really though, its when people say god exist becaue jesus died on the cross, or when they say x is true because jesus died on the cross.