........ snip............I wonder just how drunk one would have to be to think that lighting your hands on fire on an airborne aircraft wasn't a really, really bad idea
I think the answer is "regular drunk". You can't do bar tricks successfully if you're "knee-walking drunk".
I'm old enough to remember drinking Flaming Hookers at the O-Club bar. Although I never set my face on fire, I witnessed several of my fellow Naval Aviators do exactly that. Often the flames engulfed their hands too. None of them were particularly drunk, just regular drunk.
Of course, that was a long time ago when performing stunts at the bar was considered just good old fun. Fighter pilots were expected to be ....... um........... colorful. These days even driving by the O-Club might be harmful to your career.