4. Drake Bell
Known for: "Drake & Josh", "The Amanda Show", voice of Spider-Man on "Ultimate Spider-Man", making fun of Justin Bieber A LOT on Twitter.
Seinfeld Appearance: "The Frogger" This is a real blink-and-you'll-miss-it appearance. One year before he became a Nickelodeon star, Drake Bell had a very small role as Kenny, a young boy playing Frogger in a pizzeria. It's hard to tell that it's him because for much of the scene, his face is either blocked by his long hair or the camera's attention is elsewhere. But it's definitely him. His "Seinfeld" fame begins and ends with playing Frogger while Jerry and George hover behind him. When George's incessant tip shouting distracts him and makes him lose the game, Bell rolls his eyes and says "thank a lot" and walks off as George calls him a punk.