One I was standing in the checkout line at a Target store. The guy ahead of me had two bottles of Heineken beer and two bottles of Pennzoil motor oil. I told him, “whatever you do, don’t get those mixed up”.
Once long ago my friend was bleeding the brakes on his car into an empty beer bottle. Problem was, he was drinking a beer of the same brand at the same time. Well, he wasn’t paying attention and ended up taking a healthy swig of brake fluid.
He was in the hospital for three days.