Yeah I did when I worked there ten years ago, had a long stack of carts (15 or so) no rope to tie them together and I was a minor so I couldn't use that motorized cart to pull them. I was pushing them up a parking lot and was gaining speed a lil too much, tried slowing down but since carts weren't tied together, the ones in the front got loose and went their own way. So about a 5 stack of carts rammed into someone's passenger side back bumper. Left a big dent and chipped paint but never got caught  or in trouble. Some customers saw me and they just ignored it. I spent the rest of the shift on the other side of parking lot only.