> you're safe from legal repecussions.

Not necessarily: no way to tell whether it's sufficient until it actually goes before a court.

Excellent point. As a matter of legal principle in the United States you can't unilaterally disclaim liability for future injuries. Signs that say "not responsible for accidents on these premises" don't hold up when you run a retail store where people are expected to freely to come and go as they please.

More concretely: a perfectly reasonable judge could decide a dangerous step-by-step how-to guide negates the prior "for entertainment purposes only" warning. There's a reason Jackass frequently had skull-and-crossbone warnings and didn't show much of their set up, just the results

I was being sarcastic with that, should have written it as: you're "safe" from legal repercussions.

Fair enough :)