His drug problems have almost been a running joke during most of the shoot interviews he's done over the past year or two. The trailer for the RF video one is based around him calling his dealer for some "medicine".
I'm more intrigued over his wardrobe being comprised of outdated wrestling T-shirts.
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It's not as stupid as other comments here, but I once heard a guy say that the current Undertaker is not the same man as the "original" Undertaker, and that in fact the guy who played the "original" Undertaker now wrestles as Kane.