I don't know about most embarrasing - like Farnie - I've had my fair share!
This year I went to visit an old buddie, who's partner was having a party at his parents farm - in one of their barns. After copious amounts of alcohol I'd decided I'd had enough and decided to go to bed back at the cottage we were all staying in. I was sharing one of the bedrooms with my female buddie, anyway I was in bed and I could hear some people come into the cottage..saying my name..so I thought it was my mate being drunk trying to find me, but it turned out to be a couple of guys from the party..anyway they wouldn't bugger off, so I stormed from the room in my pants and bra (I travel light) and went outside..thinking they'll give up and go, when they didn't seem to be coming back out..I tried pushing against the door and realised I'd locked myself out. I couldn't bang on the door because my mates, partners parents were asleep inside..so seeing some guys shoes by the door..I put them on and started running across the field back to the barn..yes..in my pants, bra and some over-sized trainers! When I got there..I was trying to attract my mates attention..without all the other guests seeing, except I didn't know they had security lighting on and as soon as I stepped a bit closer the whole area was flooded with light and me in my underwear! She now likes to call me 'Goldie-pants' as one guy at the party shouted.."Are those gold knickers?"