Trick other people with accents from around the world and watch them look mystified.
That's always funny! Me and my friends sometimes do that and people on the hill usually stop and give us the "wtf?" look. One time when we did it, ski patrol was on the lift behind us and gave us a look as if they were pissed and were coming after us. We then started trying to speak Spanish in hopes that they wouldn't try to confront us because they couldn't understand us.