Steven Tyler and Joe Perry
Maybe it's who's the better songwriter, maybe it's who wears hair feathers better, but Steven Tyler and Joe Perry have had their arguments while cranking out monster hits like "Dream On" and "Love in an Elevator." They were performing the latter in 2010 when Joe Perry appeared to push Steven Tyler off stage. Nice one. If that wasn't enough, he then called Tyler's American Idol hosting gig "one step above Ninja Turtles."