Looks like a fun evening! I've never tried jellyfish either (although I'd be willing to). Seems like one of those foods you could use to gross out foreign visitors. When my brother came to Japan to visit me several years back, I enjoyed eating octopus in front of him and deliberately let a tentacle hang out of my mouth while doing so. The look on his face was priceless.

Have you ever tried whale meat? That's another item on my list of things to experience before I leave Japan, just for the novelty of eating something controversial.