It's never happened in one of my games, but that's only because a draw was agreed to in positions where it would have happened. It's easy to construct a position where it can happen.
(hide) If you click on a person's name and then click Finished games you will have a list of games that have been completed, then click on the name of the game to get a summary of all of these games, then click on the name of the game again and you will have a game to view and analyze. (Servant) (show all tips)