Take this scenario:
There's about eight inches of space on the actual sidewalk. Then you hit a slight ramp before reaching a step...so my stroller hand to be lifted at an angle up and over. Because these kind souls parked on the entire stretch of sidewalk and didn't want their cars hanging in the street, those of us with wheels had to either walk into oncoming traffic to get around or find an extra pair of hands to get up onto car-proofed ground. Made me so hopping mad (the proverbial straw...), that I made a spectacle, pretended to smash the car with the stroller and then found my camera and took photos. Because I am just SO mature like that.
I even got their license plate number.
Barring the baseball bat scenario, which is probably ill-advised and might get me shot, I thought of something more subtle:
Or possibly fake key marks. Something to inflict a little psychological torture on the louts who have no respect for pedestrians, strollers or the handicapped. It probably wouldn't change any behaviors...but oh, the cathartic release I'd feel...