My best friend and I travelled using public transit to get where we needed to go within the city.
We would board the bus, and sit down.
Then, I would either have a misunderstanding 'Daddy' on my shoulder that I argued with (to make my friend laugh).
Or, my favorite, I would get up and walk down the aisle, holding onto the rail on the top of each seat back.
I would look under each seat.
When somebody asked, "Did you lose something?"
I would look at them and reply, "Oh no! I am checking to see if they are all the same as under my seat."