I've gone through many phases of different catchphrases, all of which annoyed my family and friends no end...
My current favourite though, is saying 'shut up woman, get on my horse!' to my girlfriend, just randomly whenever I feel like it. She knows where it's from and knows I don't mean it, but it pisses her off badly. I must admit I enjoy the unimpressed look she gives me when I say it though.
For those of you who don't know where it's from, google 'Amazing Horse'... I can't remember rules on linking and such, but it's a bit NSFW, so I'm hoping this abides by the rules