Pinching toddlers

So I just remembered something slightly odd about my childhood. When I was about 8 years old I felt the strange desire to pinch toddlers, especially the ones with chunky arms, I wanted to pinch their chunky arms - not in a "you're so cute I wanna pinch you" way. I remember thinking it was weird at the time, but now I don't even remember why I wanted to do it. It probably has something to do with getting a reaction from an apathatic child (you know those apathatic toddlers that just sit and stare, snot running down their faces?) I couldn't stand those kids.

BTW I've never done it.