Did you know that in Italy wearing white socks is seen as a sign of weakness or of being a "mamma's boy"? Or that In Canada it is impolite to remove your shoes when entering someone's house?
Or here's one for you J, that in Germany it is a considered gauche to make a fuss or object to someone smoking, and that, in the workplace you are expected to bring cake or buy lunch for your colleagues when it is your birthday or you are leaving the company?
Check out many many more Faux Pas listed by country here.
Don't leave home without them!!