On the final day of the regular season, the Anaheim Ducks had to use an emergency backup goalie, or EBUG, after both of their goaltenders were injured in a game against the Dallas Stars.
As Brent Burns proved recently after a San Jose Sharks' practice, forwards and defensemen could also be a good option to throw in the net if need be. Burns was filmed wearing teammate Kaapo Kahkonen's goalie equipment in a scrimmage against 10 and 11-year-olds.
Obviously, teams don't want to risk their players getting injured playing a position they're not used to, but it would make for good entertainment!