By Denise Martin, Emily Christianson, Todd Martens and Lora Victorio, Times Staff Writers As Sean Combs launches his latest reality show "P. Diddy's Starmaker" on MTV, we take a look back at the cable network's hits and misses, and wonder where the mogul's new offering will fall. 'Jackass' HIT -- Call it the forefather of YouTube. Johnny Knoxville and his band of merry suckers for pain embark on the most stupid stunts they come up with in a weekly game of one-upmanship. The series spawned "Jackass: The Movie." Made for just $5 million, it rang up north of $64 million at the box office.