Some people are just curious. I parked my bike at REI, came out later and noticed that I felt every bump in the road. Later realized that someone had locked off my front fork shock absorber that I almost always leave on. It's just a knob that turns back and forth 1/4 turn, someone was probably just playing with it. Come to think of it, some guy's toddler was stumbling around there when I was locking it up. I think sometimes people play with things and don't really know what they are or what they do, and just want to see what happens or how they work.

Just guessin'...