Two scientists walk into a bar... The first scientist says to the bartender, ""I'll have some H2O."" The bartender nods and gives the man a glass of water. The second scientists says, ""I'll have some H2O, too."" The bartender nods and gives the man a glass of water as well, because he speaks English and understands that the second scientist, rather than requesting a drink which would kill him, simply wanted a glass of water in addition to his friend's.