Roller coasters are thrilling, but there is virtually no risk that you will get injured or killed. After you do a few extreme activities where there is no guarantee of safety, roller coasters and other thrill rides at amusement parks are really no big deal - i.e., surfing catamarans in large surf[video=https://www.youtube.com/watch?v=gWBvVedo9QU&index=1&list=PLep2W3cQtQX1B5-6QkzDgxHRY-moxRnxT][/video]