Nothing is Foolproof

Here's a clever way to keep track of how old the coffee is, using two foam cups. Good idea, huh? This was seen at a nurses station in a hospital in Louisville, Kentucky. Redditor Jackytar saw it and decided to try this out at the emergency room where he works. Lo and behold, here's what happened:

More proof that nothing is so foolproof that a better fool can't find a way to mess it up. The day shift blames the night shift, and vice versa. Link