Mine was when I went to Tenerife a couple of years back with two friends. We went into this bar where there was a Celine Dion tribute type singer. The bar was packed and the only free seats we could see were right over at the back on the edge of this elderly couple's table. We walked over and asked if it was ok if we could sit with them, they agreed. After getting drinks from the bar, we settled back to listen to the female singer. After a while we started slagging off the Celine Dion bird, saying things like she wasn't that good a singer, it looked like she was wearing an ill fitting wig, I bet she gets the ride every night etc etc. Basically running this girl to the ground. After her next number, the Celine Dion bird started chatting to the crowd and explained that she came from Manchester. She also said 'We love shopping don't we Mum?' to which the elderly lady we had been sat with for the last half hour replied 'Yes Dear' whilst giving me and my two friends evils!! Needless to say with very red faces, we sank our beers and got the fcuk out of there!! There was also another embarrassing experience I had which involved me, some stairs, and my gusset on show at the bottom of them. I'll let you work out the rest!