This reminds me of a skit I saw yeeeaaaars ago, I can't remember the show, perhaps someone will know, but someone was taking the author of a 'Easy Teach Yourself To Play Guitar' book to court because it didn't work.
And to prove his case he got in these famous guitarists as witnesses (I want to say Mark Knopfler, Eric Clapton, that sort of thing), and they would come in, play some great guitar and then get the 'Teach Yourself" and suddenly they would be complete crap. *plink*plonk*twang*