Yeah the glacial surfing is damn cool. The dynamite surfing is a cool special effect, but me thinks it isn't real.
Are tidal bores the waves that happen at a big rivers mouth? I think that's right. I've seen some cool sh*t by C. Addison and his blokes in the Amazon's tidal bore.
I remember a video clip I saw years ago where a guy was surfing the wake of a nuclear submarine. I may have been fake but I can't find it on the web now.
P.S. I remember seeing some guys who surf the wakes of supertankers in the Gulf of Mexico in Texas. The waves were small, but they lasted a long time.