Be warned: as usual, when we get more grandchild time, you get more grandchild fare. Here's a Joseph story from our trip to the Swiss Transport Museum in Luzern, about which I hope to report more later.
Near the space travel hall there is a wall of curved couch-like segments that kids love to climb on, over, and around. A couple of somewhat older children—I'd say aged 10 or 11—were also there. One of them, clearly revelling in some newly-acquired foreign vocabulary, flopped down on a curve and exclaimed, with a heavy accent, "What da f***?!"
Joseph, our tape-recorder child, promptly flopped himself down in imitation, and loudly proclaimed his own interpretation: "What da fun?!"