The Czechs drink more beer per capita than any other country in the world. There are only two occasions when a man will walk through a door before a lady - when entering a pub to take the blow if there's a fight, and when entering an elevator, in case there isn't one there! They invented the freaking sugar cube, and boy are they proud of it!
Prague taxi drivers deserve their bad reputation. If you must hail a taxi off the street ask for the fair before you get in or you'll probably get taken on the scenic route, you have been warned! Make sure you validate your ticket for the metro in the little yellow box before you enter, tourists are often arrested for not doing this, not so rock n roll. If you visit someone's home take your shoes off, it's really, really rude not to.