50-50 on a rail - flatbar or handrail.
i can definitely do it but i would have to warmup to the 50-50 with like almost everything else. would rather do almost ANY other trick on a rail before 50-50.
i personally have never been pumped trying one, but i have watched numerous people either knock themselves out, break arms, wrists, dislocate shoulders etc etc etc trying to do them, so i just really don't want to try them at all anymore.
blunt fakie is also a great one. i can do them and have never hung up one, but i'm still pretty scared of them. i do the big pop out, i can't do the chill little kind fakie manual back in. would rather kickflip out to be honest.
also, just dropping in on anything over 9/10 foot. i know i can do it, but i get petrified up there. shit's crazy!