Boomerang
The dog is focused
So I buy a boomerang and, today, Madeleine and I head for Richmond Park to give it a go, me warning Madeleine not to get her hopes and "it's going to be a disappointment." And it is, accept for the dog, who does indeed retrieve the boomerang but only after a long chase. We have a good laugh nonetheless.
Me: "Boomerangs are physics at work."
Madeleine: "Why do you always have to ruin it like that ? "
Me: "Well, without knowledge, we would be like Rusty. Unable to drive a car nor program a VCR."
Madeleine:
Me: "You have now idea what a VCR is, do you?"
Madeleine: "No. Is it some sort of radio or something ?"
Me: "You win."
And off to Paris in 30.