The first kind of trick play that comes to mind is something I'll call "haha you're blind now!" There will be a strip of laser pointers lining the boards all the way around the hockey rink. Each pointer can move on a swivel and the whole system targets every opposing player at once. The coach just has to flip a switch at the bench and suddenly every player on the opposing team is being blinded by laser pointers to the eyes. This makes for easy chances to score as the opposing team just starts ramming into the side and has no idea what to do to continue play. They may know where the action is based on all the noise and can scoot their way over to the general area, but that's why we have snow shovel attachments on our hockey sticks: to push them aside if they're blocking the zone. I knew those would come in handy at some point!