There has been several... incidents. None with catastrophic consequences, but there are three in particular that makes me want to punch myself.
Age 12: I have just fallen in love for the first time and was trying to think of a "pet name" that I could call the girl in question. For some very, very odd reason I settled on "Meatie" (as in meat as an adjective). Seemed like a good idea at the time...
Age 19: I have recently moved to a new dorm and we are having a party. I get along really well with one of the girls there and the night is on track to someplace very pleasant. However, towards the end of the night, alcohol and sleepiness must have scrambled by brains, because all of a sudden I say "Well I'm going to bed... it was great meeting you!", give her a quick hug and walk off to my room. The girl was great looking too! It wasn't embarrassing on the spot, but thinking back on it I just want to cringe.
Age 21: I was at Subway with a friend. I was kind of lost in thought after I had placed my order so I really wasn't paying attention to what was happening. The girl behind the counter asks me if I want extra cheese. I snap out of my dreaming and say "Huh? Tits?". Granted, the words were in Swedish, but that doesn't really help matters. My friend overheard this, and is kind enough to remind me every time we go for lunch.
Oh, and: My first post on these forums!. Hi!