When I was maybe 4 or 5 years old, I made friends with another kid in an airport, and he was playing with a couple glued together Lego cars.
Me and that kid played for like an hour with those things and when it was time to go our separate ways and board the plane, the kid insisted I keep one of the cars, and while I insisted he should keep them, he said it was proof that we were friends, and to this day roughly 20 years later, I still have that car packed up with my childhood mementos box. That friend of mine was a good kid. Hope he’s doin well.