There was a thread about DESCRIBING embarrassing photos. This is about posting, but you don't have to post The Most Embarrassing Photo Ever, I won't because I don't have that one here and you're not seeing it anyway.
What I do have is one from when I was going through my goth phase at 15 and wore a top hat because I thought it looked cool. Give me a minute to dig it up, and you just get thinking about your contribution
(I realise this can quite easily fail, but come on, we can do this)