I have 2 answers maybe, one was when me and my brother got lost and had to be rescued by helicopter, which was absolutely humiliating.
But the other is probably more embarrassing, which is about a year ago now, I had a girlfriend, and I was all miserable.
So I called the national radio show Loveline, and then made a mess of myself, to people all over the country. I was thinking afterwards "So now it's not enough to be an idiot anymore? You have to be a nationally witnessed idiot?"
And I guess I've also had several embarrassing moments relating to sexuality... :P
But those are different, and numerous.
So anyway, what have been your most embarrassing moments?