They're the latest competition to go viral. It’s those crazy, jerry-rigged contraptions called Rube Goldberg machines, and the "mousetrap" builders who create them are very combative.
It only takes one motion to trigger a chain reaction. This hair-raising new take on Rube Goldberg is from Redbull.
This next one is done entirely by free-running. You instantly feel like you're on the set of an action movie with stunt doubles.
Finally, this team of engineers from Purdue University are the actual Guinness World record holders for the largest Rube Goldberg contraption. They devoted 5,000 hours to breaking their own record.