Oh, many things! I could write about it for 3 days!

But the thing I would definitely point out is - their bathrooms!
They don't have a shower in the bathroom. They have just a tap in the middle of the bathroom and when you are showering water is falling all around the bathroom. They have special flippers for standing on the floor for this. It took me like 10 days to get used to this :D but it was funny :)