I've never had the chance to really experience narcosis, and it has always bothered me that I lack what seemed like an important experience. The closest I got was an unclear feeling that my time and distance perception may have been somewhat altered, but the intensity of that experience has always been at the level of confirmation bias. The deepest I've been is 140 feet, so not much at all, although by some standards I would have already been pretty damned narced by then. I realize I most likely was, but since I've never quite felt or observed any clear symptoms of it, it doesn't exactly qualify as an "experience". I thought of taking a recreational chamber ride, but from what I've been told, the kind that would fit the bill is not really much of an option. Puzzles like writing your name backwards, etc., seem useless, and don't do anything for me. I do not feel sad or happy, I have no apparent memory issues that I can recognize. Taking the 73m PSAI course is not much of an option at this point, either. So, what's the simplest and safest one can do to explore the limits of one's impairment, without going very deep on air? What kind of creative problem solving can a pair of buddies surprise each other with to clearly demonstrate impairment on a 100-foot dive? Apologies if this has been covered a million times before, as I imagine it must have been, nothing clearly jumped at me among the search results. Feel free to kill this thread with a reference to an earlier discussion. I'd imagine that this question would be relevant to many inexperienced divers. Thanks!