This sign...nay...memoradum was posted on the bathroom in the lab.
Please note, ladies and gentlemen, that this is a signed, dated memo. It also makes one's mind wander to the unsavory imaginings of the mess that merited this dictum. And how do they know that one particular lady is behind this malevolent deed?
Either way, it's pretty much the best "if you sprinkle when you tinkle" sign I've ever seen.