O My

(I work in the R&D arm of a very well-known engineering company. One day I walk into the staff kitchen to see a manager filling up a glass of water from the tap and emptying it again with a look of disgust. It should be noted that the water was slightly cloudy due to tiny air bubbles in it, which can happen sometimes.)

Me: “Uh, what are you doing?”

Manager: “Ugh, I can’t stand oxygenated water; it’s not good for you!”

Me: “You do know what the O in H2O stands for, right?”