In the bowling training mode where you can bowl up to 91 pins, for the last stage of 91 pins there is a trick to get an automatic strike without touching a single pin ! This is not a glitch and was programmed in as a skill shot, to see how it's done watch this video:
http://www.youtube.com/watch?v=gTsjnjsO-E0
http://www.youtube.com/watch?v=gTsjnjsO-E0