Did you ever go through a ceiling in your adventures?
No, and I'm well over 200 explores now. You get a feel of how far you can take it. I know of other explorers who's legs have gone through up to the thigh and suffered injuries.
I get injured all the time during these, but it's always minor. Scrapes here and there, it's worth it.
have you ever been to a place that freaked you out?
I don't get freaked out easily, you build up a resistance to it somehow.. so again no!