Many years ago, I was a coop in a small lab at a large organization. Staff members sat at two desks, and I usually sat at one of the two adjacent benches. A friend from high school asked me to make a flashing beacon for the model rockets he flew. I went to Radio Shack and bought an LM3909, copper clad, and a small bottle of ferric chloride etchant. As luck would have it, there was a perfectly-sized graduated cylinder in a utility room at work, so I decided to take the etchant and board to the lab to do the etching. I set the graduated cylinder containing the board and solution on the bench. The staffer who sat next to me arrived for the morning and expressed concern about the hazardous chemical mere feet away from his desk. I assured him that it would not be there for long, and that I would not spill it. As I worked away on whatever task I had that morning, an idea came to me.
I always brought my lunch, and they usually went out. Around noon, I went to the utility room, emptied out the solution, rinsed off the etched board, and washed the graduated cylinder three times. Back in the lab, I poured some root beer in the graduated cylinder and placed it on the pull-out shelf on the nearby desk, then ate my lunch. When the concerned staffer returned, he was aghast and demanded that I remove the noxious chemical from his desk. I picked up the graduated cylinder and drank from it.
Unfortunately I could not contain myself and started laughing a few seconds after taking a drink. But it was still great fun.