When Cliff Jumping And Trampolines Combine July 1, 2015 | By Staff Post Share now: Support us! GearJunkie may earn a small commission from affiliate links in this article. Learn more. Cliff jumping and trampolines, what could possibly go wrong? Hold my beer and watch this. Few things are much more reminiscent of summer than lobbing your body off a perfectly good cliff into a quarry, and these guys are pretty darned good.