I LOVE convincing people whom never do such to join in the unexpected. Once talked a group of friends (including a Pastor's wife) to done pajamas and robes/slippers to do the all night Black Friday (Thanksgiving night) shopping spree. Got all kinds of crazy commentaries, but grew like wildfire into other cities and states with other groups whom now treat this as the craziest of traditions. Also get a group of honest to goodness adults way over the age of thirty to now and again toilet paper houses of other friends. This was at first accepted with the barest amount of polite enthusiasm, but not now. It's now tradition also if someone goes into the hospital we show up with puppets when they wake. Randomly, for birthdays we will be let into homes dressed as the most odd assortment of angel wear to wake the birthday person up with song and vitamins to prolong their quickly escaping life. 
The craziest though was when on a medical missionary trip to Peru, we started from the 
Amazon, to the Rio Nany, to a small thread of river, to a small village trudged uphill and found ourselves stranded in a serious thunderstorm, or options were limited to a building roofed in metal, in an area where we were the tallest, or hoping to get back to the boat which was no longer tied to the now broken tree downstream, and moving away as a fast speed. Since the gators were coming OUT of the water, that option didn't look good. However, since I took my contacts out, and couldn't see much with my glasses on, I didn't see the gators, but could see the blurr of the boat. While the others  chose a cove of trees a bit downhill, I slid down, waded through the water (hoping that the piranha wisely went to the calmer lower ends of the water) and wrongly guessed at what I thought were encouraging commentaries from friends on the boat. As they helped me in, they shared about the (thankfully) disinterested gators whom were more interested in getting on shore. Besides, they were all small. Most villagers already killed and ate the bigger ones since this was at the end of the rainy season.