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!
I do this all the time! Whenever I'm walking I'll finger drum on my phone and/or wallet that are in my pockets. Or on the desk at work to whatever song is playing on the radio.