I cannot think of a better way to hurt myself by crashing into a mother of three with a triple-wide baby-jogger, then ricocheting off some teenage roller-disco queen with full-volume earbuds and zero awareness before tangling up in the 12-foot leash of an oblivious dog-walker.
I could maybe hit any two of the three on an MUP, but getting them all close enough together for the triple-points score takes the confines of a sidewalk.
Unfortunately, "sidewalk speed" is walking speed so none of the injuries are serious. Can't win 'em all.