I got a restaurant I worked at to buy a tank of N2O for staff.

The kitchen staff kept huffing my beer gas (N2 & CO) despite multiple warnings and explanations that it wasnt getting them high, just suffocating them. Twice I found a guys passed out in the walk in, still holding the still running line. The gas is heavier than air, so it pools on the ground, and it was a small walk in that didnt cycle often, so this was really dangerous.

I managed to convince the owner that buying a N2O tank for $300 and occasionally 'forgetting' to lock it up was way cheaper than the costs associated with a staff member dieing on premises, especially considering the health dept would almost surely force us to replace our old system and put in air testers and stuff.