[Dr. Bogus Pachysandra]

Someone would figure out how to hack into them and change the messages to dirty jokes or something!
Or turn the volume way, way up, so being in the store would be annoying. Imagine a store full of grocery carts screaming the most inappropriate things! 8^)

[MaxMax]

Great ideas. Also have fifty people grab carts and place them all over the store
with the volume up, then walk out.

I doubt any store will allow this insanity. To many heavy objects to break them with.