This has got to be the ultimate user experience. I am sitting behind the pilot in this Russian designed L39 Jet. If anyone would like to try it is quite expensive but is something you will never forget. Here are some links:
My pilot was Dave Riggs who is a hollywood stunt pilot for films like XXX, Iron Man, Lord of War. We flew together with David LaFaille and did some combat flying and some low level flight avoiding radar in canion, by low level I mean we flew 4m of the ground. My stomach had a problem digesting this new user experience so we finished the day with some formation flying.