LOL.
We had a shipper/receiver who stacked empty cardboard shipping boxes up like that. I once stayed late after work to run a trip wire from a post to a lever that propped all the boxes up in a big, precariously balanced stack. The next morning he came in, tripped the wire, and all the boxes came avalanching down...and I laughed like a devil and watched! I got beaten to a bloody green pulp for my troubles, but hasten to remind everyone that it is hard to defend yourself from the punches, slaps and kicking when you are laughing your guts out...