The marketing stunt came to a halt after just one day when the security guard noticed the metal frame of the glass case had been weakened from the constant barrage of physical pressure.
Why not just let people keep going until someone breaks the frame? Still makes for a good marketing blurb - "the iron broke before the glass did!"
Neat! My mom's golden retriever used to try to "save" people from swimming in a pool by jumping directly on top of them, we had to train her to stop.