See how far you can push it out until it collapses.

Yeah, I had to quibble with that too. And I definitely play with my keys when waiting at the bus stop, or equivalents of that.

But it's not something I do to the exclusion of other things; it doesn't capture my attention for 10 minutes at a stretch; it doesn't interrupt my conversations or take their place.

They're fun! Like yo-yos that you don't have to wind.