The Kid Should See This tweeted the link to this great video, “Which Door Will the Ball Hit?” so I think it’s only fair to send you to their link to read more about it. I adore this idea from Joseph Herscher of using Rube Goldberg-type machines to make video puzzles, and I think it would be an excellent “hook” to show students before asking them to design their own. To get some practice before they design their first prototypes, they could play the Bubble Ball app, Goldburger to Go, or this game on Engineering.com.
You can also view more of my Rube Goldberg posts here. And, if your students enjoy puzzle videos, the TED Ed riddle videos are great. (My students were big fans of the River Crossing Riddle.)