If I'm in a gondola (does this count?) I usually pull down my ski mask and smile at everyone the whole way, keeping my goggles on. It gets people so nervous and uncomfortable.
I especially like messing with families with annoying overprotective parents who despise snowboarding. Maybe my smile freaks them out, but they can't do anything about it. What are they going to say? This punk smiled at me all the way to the top?