Don't believe everything you read on Reddit. It might happen on extremely rare occasion, but I doubt it's a thing. I would expect more people to walk into traffic or fall down stairs. Swimming on drugs is stupid, but never off the table for humans.

You're the first person I've heard of this happening to. Are you among the 10% that are hyper-sensitive to ketamine? If so, I don't know if it would be the pain relief you seek. Either that or you took way too much and/or you be tripping but not really as aware as you might think you are. Then again my mistress Ketamine, Goddess of Mathematica and Mischief, is ever the prankster, even with unexpected results at times.

If you do try it again, obviously stay away from water, stairs, candles, and traffick, and consider going in super mini-doses, counting the crystal grains. If you know how much is in a snuff bullet bump, then divide that amount in to 8ths to cumulatively try every 10 or 15 minutes until you reach a comfortable threshold. Don't watch a movie (it gets frustrating when you can't follow it), find some nice music, lay on your bed or sofa and meditate - and critically plan to keep doing that. Don't get distracted and think you can go do something else at the same time. Ketamine is not a multitasking sport and you'll only fail, be frustrated, break something - or DIE. I like to watch the patterns on the inside of my eyelids (much better than when you rub your eyes hard) in a waking dream of sorts.