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!
Running short distances for no particular reason. Like if I'm a short distance from the car and realize I forgot something in it, I'll run there and then run back.
Sometimes people are like "what's wrong?? why are you running??" and I'm just like why not? It's fun.