Lawrence Wright's Scientology book Jan 16 2013
John Travolta began taking Scientology courses before his audition for the TV show Welcome Back, Kotter, and fellow students pointed in the direction of ABC Studios to telepathically communicate: 'We want John Travolta for the part.' (He got the part.)
Thankfully, Horshack got the part the old-fashioned way. He raised his hand and said, oooooohhhhh! oooooohhhhh! oooooohhhhh!