It couldn’t have happened at a better time, like in front of a table of journalists who happened to record the entire thing for posterity’s sake.
During an interview with The Des Moines Register, USA Today managed to capture the entire exchange which began when a tiny ‘hello’ emerges and Bush looks utterly confused. It is exactly as you imagined if someone came across a talking bunny in a meadow.
Thanks to the more tech-savvy person off-camera who helpfully volunteers, “Is that your watch?”, Bush finally registers the fact in a priceless moment of epiphany. We're not going to spoil it for you, but his reaction is classic granddad.
It could happen to anyone, but Bush is a self-professed Apple fan and potential US president. What else is he unaware of but claims to know? Only time will tell.