You haven't heard of Linford Christie in Malaysia then?
While at Uni, I was in my final year, and having done a placement year the year before, hardly knew anyone in one of my classes. There's a group project, and I end up working with a guy from London, a girl from Hong Kong and another from Malaysia. We would often meet in the cafeteria thing, and I had a lunchbox of food with me (the cafeteria food was pretty horrendous).
So, one group meeting, out comes the lunchbox for me to get at my sarnies, and the Malaysian girl said: "Vince, that's such a big lunchbox!" Cue me and (tall black) London bloke, lolling all over the shop, maybe even a few rolfmayos as well.
As the tears were drying out, she looks at us in all innocence and asks why we're laughing. We had to explain, in detail, the other meaning of the word lunchbox. Cue then much asian girl giggling, and they didn't look at me in the same way again.....

Another I've just remembered - while on a cadet camp one year, we were in tents as opposed to billets (always nice on a flying station!). On the orientation, the officer showing everone around said: "Girls, remember to keep your flaps shut after dark!". The poor bloke didn't realise he was talking to the dirtiest squadron in the wing.....

(that's my head over the parapet for long enough, lurky time again).

Knob joke: Insert yours here (oo-err)
(vinny, Tue 17 Jun 2008, 13:19, Reply)