Have you ever done something out of custom(culture?) then you realized "Why am I doing this?"
I just realized that in Indonesia, we have to ask permission from other people to eat, if you know them and at the moment they are not eating with you. We are cultured to say things like "makan dulu, ya" (let me eat first?) or offering it"makan, mba?"(would you like to eat?). We don't really offer it though.
So, is there any funny thing like this you realized about your culture? I'd like to know from as many country as possible;)