10 Pop Stars Who Should Have Been One-Hit Wonders

"YouTube sensation" doesn't usually equate to "long-term megastardom." Somehow that managed to be the case for Justin Bieber, despite producing a debut single that didn't even try to hide the fact that a pasty, smiley thirteen-year-old was trying to sound hard while rocking an Old Navy hoodie and a haircut that looks like a Lhasa Apso caught in a windstorm.

And this was before YouTube became an actual launching pad for musicians. (Carly Rae Jepsen would follow in the Biebs' footsteps a few years later, and she seems on her way to having a legitimate career now.) How did he do it? More importantly, how did he swindle Usher into funding his adorable campaign of terror?

Whatever the reason, Bieber went on to have an excessive number of hit songs (one of which features the word "baby" no fewer than 1,900 times) and a public downward spiral that resulted in him becoming a punchline for another two decades, at least.