Belly button picking. That's what I used to do when I was little. I'd lift my blouse up a little exposing my tummy and start picking at my belly button. It never fails to amaze me at the stuffs I'd find in my bb. Dead skin, lint and dirt. Gross yet gratifying. Bb picking also happens to give me the urge to pee which felt weird. A kiddy habit which didn't continue into adulthood, thank goodness. Speaking of which, I'm thankful that I grew out of nose picking too. (:
I was imagining this scene where a 6-year-old girl is standing at the sidewalk. A few feet away is a pregnant lady haggling with the grocer. The little girl is staring intently at the lady's peekaboo bb. She slowly reaches underneath her t-shirt and starts picking at her bb. She giggles with amusement because it felt ticklish. The lady catches a glimpse of the little girl, smiles at her while touching her own bb as well, probably reliving her own childhood habit. And the little girl shyly skips away.