Two things
-snoring, moaning, groaning sleeping noises & twitching. Yes he can do all four at once.
-his farts stink to high heaven. Sometimes I sware something died up there. He cleared out the bathroom at work a few times. Before they go, they check to see where hubby is.
I guess if I had to narrow it down to 1 thing it would be DH inability/unwillingness to plan anything. It drives me nuts when he tells me we are going somewhere 10 minutes before we are supposed to be there.
I'd love to change his: putting his dishes everywhere except the dishwasher when they are dirty, or waiting until you have to hack the grass with a huge blade to find your way through do cut it. And his horrible procrosatination on everything I have a kitchen that still needs to be finished after beign started on a remodel 5 years ago. NICE! If I have to do everything else, he can do that or it won't be done as far as I'm concerned.
Other then that, he's the most caring, sweet, loving, man I could ever ask for!