Jason Sudeikis
Everyone remembers this video. Mumford and Sons' "Hopeless Wanderer" video doesn't feature the band playing the song at all. Instead, it's a misfit group featuring Ed Helms, Jason Sudeikis, and Will Forte. It was a truly ingenious idea.
Danny DeVito
Danny DeVito appears in one of One Direction's last videos before they called it quits. "Steal My Girl" showcases DeVito as the music video's director, and he's less than pleased by the band's performance. Since then, all members have kicked off successful solo careers.