Inside-Out Boy

Inside-Out Boy is a Claymation character that appeared in five Nickelodeon shorts between commercials in its original run from 1989 to 1993. The character was created by Scott Webb and Will McRobb. The first short tells the story on how I.O.B. became who he is. He is playing with his yo-yo, then goes on a swing, then after swinging too high, he swung over the bar and his body flipped inside out. That's what made him become Inside-Out Boy. To kids, he is a superhero with his inner body parts exposed, but it grosses out adults making them jump away and scream in the process.
The shorts have him in situations like having him help his friend at the Science Fair, Impressing a Girl, having a rap battle with MC Mallet, and other situations.