There is an old movie in which a group of linguists are putting together the definitive dictionary to include every word in the English language. They are somewhere in the middle after years of isolation and work when one of them meets a deliveryman and almost word he says is new to the linguist. i should think the same thing would happen if you tried to count them.

(There is also a remake with Danny Kaye and the definitive encyclopedia of music if you like musicals.)