This thread makes me want to play Rogue Legacy again. Sorry, being off topic...
Anyway, can't say I "know" sign language, but last year I went to a few free lessons by a girl who studied it a couple years ("it" being LIS or Italian Sign Language, as I live there). I was inspired by KS of course. It was a nice experience but I forgot almost everything in a few months, it wasn't an intensive course but rather one meeting a week for a few months.
This year I am repeating the experience, but with an added twist: the girl is doing a show (as in, short comedic sketches to be performed in a theatre) for both deaf and hearing people for her thesis in Social Studies, and asked all the people who were there last year to come back again.
I'm doing the usual weekly meetings but this time with actual deaf people among the students... it's an interesting if (at first) a bit awkward experience, hope this time i'm improving on myself.
The show idea is good if a bit difficult to put on, as neither I nor the other students are actors (I played a few parts for a quite small company the last few years, but that's it) and we're not used to do this, plus it won't be easy to both make signs, talk and convey emotions at the same time. But I'm sure the final product will be a great job for everyone, and maybe i would even have learned something by then