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One of my favorite things to do is grab a group of people (the more the better) and go ice-blocking! It's hard not to make friends with people who are all looking ridiculous together, and anyone who happens to be at the park you go to will be drawn to the group, so it's actually pretty good for outreach, and goes a long way toward dispelling the notion that Christians don't have fun.
What in the World is Ice Blocking?