I always wonder how a person gets a dog to do something so unnatural, I'm not always convinced it is a nice experience for the dog (a bit like the seals at water world). But yes, if you take away the thought of the training then it is very entertaining for a few moment or two.
It is very entertaining. I wonder how standing on the hinds legs for so long affect the dogs hips. I hope the owner remembers his trusted old friends in his waning days that will possibly be filled with pain.