"For entertainment only" is such a cop-out, do whatever dangerous thing and show step by step instructions but then slap on a "for entertainment only" on it so you're safe from legal repecussions.
Not necessarily: no way to tell whether it's sufficient until it actually goes before a court.
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