What is a fun childish thing you still do as an adult?
For me, it's sticking my hand out of the window of a moving car. Whether I'm driving or not, I love having the windows down and waving my hand in the wind. I've loved it since I was a child and I'll never stop doing it!
Riding the grocery carts through the store if nobody is around to hit. Ive slammed into a display once, took almost 5 min to get it back together, and no employees came to help the entire time, but i dont blame them.
Costco is the best place to do this. Big heavy carts and huge parking lots for speed and distance. I always get a few smiles when people see a 40-ish year old man flying down the aisle.