I always warn when doing cross cultural training for non-British people working with the British, about the British urge to tell jokes in the workplace. It seems we keep telling them even when we know they can backfire and the medium might be inappropriate (ie e-mail). Recently I was working with a Danish family moving to the US and they said Danes are just as bad too, in particular they have a penchant for telling jokes about sex in the workplace. They realise that they have to bite their tongues now they will be in Redmond Washington (no prizes for guessing which company they are working for).

Seasonally appropriate naughty British seaside postcard (which reminds me of Brighton, where we live)