One thing I do notice, however, is that the different nationalities' sense of humour is so varied. I have come across this time and time again. I mean, my ex-husband is American and you would think, having a common(ish) language, that we would have a common sense of humour, but not a bit of it.
Take this photo for example. Someone posted it on Facebook and I thought it was so funny. I showed it to my Irish colleague and she got a fit of the giggles. So I showed it to my English colleague, and again a fit of the giggles. Anway, I thought it was so funny I stuck a copy on the door to our little kitchenette and waited for reactions. I have to say my German colleague, V, has a great sense of humour, but she stood there and looked at it and said "so, what's funny about that?" My French colleague just said "oh, so you mean people actually steal food out of the fridge?" In fact, their non-reactions were probably funnier than our reactions. It is really strange and I have found it over and over again. Humour (for the most part) just doesn't seem to translate.
Having said that, some years ago I treated myself to two huge tomes of the complete works of Gary Larson and I LOVE it. It was expensive but every time I take out one of the volumes and start flicking through it I get a fit of the giggles again. I guess I just love visual humour and Gary Larson certainly does it for me.