I roughly had the same experience. I was with a large group of friends, about 10 people, there were three couples in the 10 people. It was night and all of us were coming back from the forest when one of the couples didn't come back. We were just screwing around when some of us got on the trampoline. Two people brought the other couple a flashlight, so they could see out of the forest. Eventually all of us got on the trampoline, and I said we should wait till the couple was walking back and be completely silent. They were about to walk into the house (the trampoline is in the backyard) and I let out a loud moan. It scared the crap out of one girl and everyone starts laughing.
Aside from that, when I was younger my friends and I spent the majority of the time on the trampoline. My friend that had the trampoline at his house had a dog, and one game that we would play is we would get her tennis ball and all lay right next to each other and wait for her to jump on the trampoline. We would roll the ball away to the other side and she would go crazy, then someone would grab the tennis ball and we'd do it over again. Good times, good times.
