Do a bungee jump. I don't think I could ever do that, too high and too scary.
Although up until a while ago I would have said hold or touch a tarantula, but I was on holiday in America and we were at a crocodile park, we went to one of their shows and they picked me out, I had to hold out my hand and close my eyes they were going to put some scary animal in my hand, nothing bothers me at all, snakes okay, rats, okay, but spiders are my nightmare, when I opened my eyes and saw a huge tarantula on my hand I think my eyes almost popped out of my head, but it was okay, it felt quite warm and not at all what I expected, my son and husband were in the crowd and they thought I just might faint or scream! but I was okay, I think it was because I didn't have to think about it, it was there on my hand, it started to move up my arm and even that was okay. Although I still would not pick up a spider at home, I am a little less scared, when I see one scuttling around the house now, I think, it is tiny, you held a tarantula. Before I could not even look at them in a book.
Still a bungee jump isn't something that you just happen to be there, you have to go somewhere high for a start, so I still don't think I will ever do that in my life..