It doesn't have to be scandalous--and I bet our DH's have a few for us, too!
Something DH doesn't know about me is: I rarely listen when he starts talking sports. And I want to press the "eject" button every time his road rage starts up. But with how I act, you'd think I was 1) fascinated with sports and 2) I totally agree with his ridiculous reasoning for getting upset at someone for going only 5 over the speed limit.
I'm a coward, I know, but it keeps the peace!