Kimmel spent the whole show in a colorful suit made of Rainbow Looms, a popular kids toy, in support of the Max Love Project, which aims to raise funds and awareness for families fighting childhood cancer.
Max "SuperMax" Wilford is the kid behind the Love Project, and his classmates called on Kimmel to promote the "Loom-a-Thon," his attempt to create the world's longest Rainbow Loom chain.
Kimmel, who choked up introducing and concluding the segment, gifted Max with a visit from his favorite super hero, Iron Man, tickets to Disneyland and his own cape made of Rainbow Looms.
The late-night funnyman will also auction off his suit in support of Max's cause. It's available on eBay until March 8. Bidding is now at $13,500.