My favorite things to do while playing goalie:
-lay down on the ice while play is in the other end. Extra points for pretending to nap.
-dance to music, real or in my head
-put my stick on top of the net and try to make saves without it
-taking that a step further, leave blocker and catcher on top of the net too, put arms behind back, and try to make saves with only my legs/torso. That was a favorite with my group of friends in college.
-scream at opposing players near the crease. Get right up behind their ear and just let rip. This works well for me because I'm very loud.