Kill-a-Half-Hour Question

Wednesday 1/29:  More than 20,000 kids each year end up in the emergency room after they encounter one of THESE.  What?
Wednesday 1/29: More than 20,000 kids each year end up in the emergency room after they encounter one of THESE. What?

Clues:  “Store” and “Wheels”
Answer: Injuries from a shopping cart.