1. I've spent ages frantically looking around my house or office for something (like my keys or a hat or a jacket), when all the while I had it on me the whole time!
2. I've gotten in the shower with my socks on.
3. I've called a lover by another man's name while makin' whoopie!

(SUPER-STUPID)
4. I've accidentally sent personal/non-professional e-mails to my boss!
I could give you more, but I'm trying to maintain SOME credibility around here!
And I'm Out!