Oooooooh, great thread.
3 things though? Are you fucking kidding? 
A few that people have already mentioned, but here's my (long) list...
Obnoxiously loud sneezes. (Though they are quiet when we're in a very quiet place - like the library, or Church, or a Christening, funeral, or wedding.)
Sometimes, when I am in the middle of a serious rant about politics or climate change, or something very serious, he tilts his head, and says 'awwww you look cute when you're trying to talk smart!' Last time I said 'FOR FUCK'S SAKE! I am in the middle of speaking. Can you NOT?' He was so wounded, as he was being 'nice' to me. 
Does a household task, and announces that he has done it FOR ME.
Has a new ailment every other week. Yet despite numerous visits to clinics and specialists and GPs, no-one has ever found anything wrong with him. Also when I have something wrong with me, (like I have a certain pain or am suffering in a certain way,) he always has to 'top trumps' it with something WORSE that what I have. 
Phones me at work to ask 'what's for tea?'
Licks every yogurt lid 100% clean. (Weird and annoying.)
Sometimes, when he is watching something I am not interested in, I read a book or magazine, but he insists on gives me a running commentary, (on his programme that I am flat out not interested in!) I have said (time and again) 'WHY do you keep running through what is going on? I don't CARE coz I am not watching it! So I am not interested in it.' All I get back is 'well I am interested in it.' WTF? So because HE is interested in something, I have to sit there listening there listening intently like a good little wifey, because HE is interested in it? 
Not always - but sometimes - he starts talking over me, when I am talking about something else. I am literally mid-flow, and he zones out and talks over me. It makes me so angry. I have actually just started ignoring him now, and I talk over HIM with what I was already talking about! He looks surprised that I have ignored him. WTF did he expect?
Tells too many lies, and makes shit up to make himself and his life sound more exciting, or to just 'flower things up.' I had a bad cold/sore throat a couple of years ago, and was off work for 3 days, and when I spoke to a colleague of his a few weeks later, (when I saw her in town,) she said 'oh it's nice to see you better; when did you come out of hospital?' I wasn't IN hospital!
Also, 7 years ago, he told his workmates our daughter had got into OXFORD university and turned it down to go to Birmingham (where she went.) She applied for OXFORD, but was not offered it, and actually didn't get in, and she was furious because she felt he was disappointed she didn't get in. (He wasn't, and was actually proud of her, but he was just lording it over people.)
He hangs around in the kitchen when I am cooking - or trying to do my hair and make up to go out. He knows it annoys me, but still does it. When I sigh and say 'can you move out of my way, I am trying to get tea,' he says (in a 'jokey' way) 'yeah ok I get it, I am annoying you.' I just think 'yeah you know it pisses me off and yet you still do it!'
Often asks where something is - without even bothering to look for it. He just wants ME to look coz he can't be arsed.
Spends 20 minutes looking around all the non-foodstuffs in the centre aisles in Aldi and Lidl. But still never buying anything.
@littlestrawby
EVERYTHING is my fault. No matter what the issue is, he always finds a way to twist it around to being because of something I did or did not do. !!!
@OysterBabe
My DH is another one who has to find someone else to blame when something goes wrong. He can be really quite creative finding ways for things to not be his fault.
OMG, my DH does EXACTLY THIS. So does the DH of my best friend. Why do men do this?! It used to upset me so much, but now I take it with a pinch of salt and take the piss out of him. If something goes wrong (ANYthing!) I say 'I suppose that was my fault - I mean everything is. I wasn't there and was 20 miles away, but it was obviously me.'
Same when he cant find something. It's me who has moved it - never him, and even if it turns up in a place he KNOWS he put it (like in his LOCKED WORK BRIEFCASE,) he will say 'you were mithering about something at the time - THAT'S why I mislaid it.' My fault, always.
He is a massive hypocrite. He will pull me up on snapping at him or saying something in a slightly unfriendly manner (obviously only when he deserves it ;)) yet he will always speak rudely or dismissively to me as he sees fit.
Again , my DH does this. He will be arsey with me, or make stupid sarcy remarks, and I am supposed to take it on the chin, but if give him the same treatment, he goes into a massive sulk.
EG, I will come in from outside and say 'It's cold out there,' and he ignores me. When I say 'did you hear me?' he says 'yes.' So I said 'why didn't you not answer me then? He says' because what you said didn't require a response.' 
Yet when I did the same to him a week later, he huffed and puffed and went off on one, and stormed outside. Likes to dish it out but doesn't like to take it back!
I have made him sound like a right cunt haven't I?
Well he is sometimes..............
Then again, so am I, and he isn't like this ALL the time. He has some good and decent qualities. But this thread isn't about that is it? 