During the opening segment of "Jimmy Kimmel Live," Mark Rober, an engineer and YouTuber, introduces himself and his unique YouTube channel that combines science, engineering, and pranks. He shares clips of his pranks, including a glitter bomb package, a squirrel-proof obstacle course, and a powerful T-shirt cannon. Mark then conducts an experiment at a farmer's market to see if people recognize him. Many younger individuals do, while older ones often don't. Later in the show, Mark showcases a series called "The RevenGineers," where he uses engineering to punish troublemakers and reward those who do good deeds. He brings three audience members on stage to potentially win $15,000 by choosing a detonator linked to either nachos, a wedding cake, or a watermelon. They successfully pick the watermelon and share the prize money. The segment ends with Mark letting them blow up the cake and nachos for fun.
Here are the key facts extracted from the text:
1. Mark Rober is an engineer who used to work at NASA and Apple.
2. Mark Rober has a YouTube channel with over 22 million subscribers.
3. Mark Rober's YouTube channel combines science, engineering, and pranks.
4. Mark Rober created a custom-built bait package that recorded a person on four different cameras and released a pound of glitter.
5. Mark Rober built a powerful t-shirt cannon.
6. Mark Rober is hosting a talk show for the first time.
7. Mark Rober has a series called "The Revengenears" coming to Discovery this fall.
8. In "The Revengenears," Mark Rober and his crew use engineering to punish troublemakers who violate social norms.
9. Mark Rober set up experiments on the sidewalk in front of the theater to see if people would help others in need.
10. Three people, Kevin, Penny, and Samantha, were rewarded for their acts of kindness on the show.
11. Mark Rober gave the three winners a chance to win $15,000 by detonating a watermelon.
12. The winners, Kevin, Penny, and Samantha, split the $15,000 prize.
13. Mark Rober allowed the winners to blow up a cake and nachos as a bonus surprise.