"gear heads" who run their mouth and tell you everything you could possibly need to know about your own car when they really have no clue what they're talking about. None...
people that won't let it go (whatever "it" is) - for instance I stopped to put gas in the Mach a couple years ago and this guy comes over and starts looking it over - "nice car" "thanks" "I think it's the one I traded in" "uh no...I ordered it" "are you sure?" WTF? Uh yeah, I am sure - are you stupid? "well it looks just like mine" Well gee...unless there's something aftermarket about it all 2003 azure blue mach 1s look the same

You my friend are a friggin genius...i'm getting in the car at this point and he's still running his mouth "it's an automatic right?" "No sir...it's a 5 speed...I don't drive automatics..." last thing he saw of "his" blue mach 1 was it fish tailing out of the gas station driveway

Seriously...what? Because i'm a girl I don't know if I ordered my car or if I bought it used? Dumbass...
stupidity in general (see signature block LOL) - I have 2 "friends" - both guys - who know everything, know everyone, have been there and done it all 50 times and have to one up whomever is telling a story...
My husband used to work with a guy like that - every time he started up again, one of them would say "I had AIDS...but I got over it - it's like chicken pox, you can't get it twice" and walk off...

(not that AIDS is funny in any way, but he was the kind of guy that would tell you he died and got over that too). Some people just don't know when to shut up or that they're making a complete *ss of themselves.