Mitsy is is attempting this very same thing through hypnosis.. :
"Physical Change with Hypnosis" Experiment
Personally I've heard of several anecdotes of people growing taller from hypnosis, but they're definitely not as common as stories of clearing skin, enhancing boob size, whatever. I bet it's possible though. Perhaps it's harder since growing in height would be more taxing, but that might just be a limiting belief we all have. I'd say your best bet is to try it. Just remember that if you're doing it for shits and giggles and not because you REALLY want to grow taller, you'll probably give up before you see any results. Stick with it and see.
