This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Muppet Babies
Gonzo's song "I'll Be Blue For You" for Camilla in the episode "Faster Than A Speeding Weirdo." It was a surprise to have such a sad song in such an upbeat show. If you've ever had severely sick or injured loved ones, and hoped against hope for them to get well again, this song will break your heart with the force of an angry soccer riot. Given that it's Gonzo singing it you'd think it'd be nothing but Narm, but... damn, even as an adult it's hard not to break down into a quivering heap at this. You can imagine what it did to the kids in the audience. The fact that it's also an Ear Wormreally doesn't help matters. * Sniff!*