This is what happens when scientists get sassy! The sign treats imperial units like they're actual profanity - because to metric system enthusiasts, they basically are! 😂
The joke about never saying the "Big F" (Fahrenheit) but using °C instead is pure scientific shade. It's basically a science lab's version of a swear jar - use inches instead of centimeters? That's a quarter in the jar, buddy!
Fun fact: The US is one of only three countries (along with Liberia and Myanmar) still officially using imperial measurements. The rest of the scientific world is like, "Get with the program already!" Meanwhile, NASA has lost spacecraft due to unit conversion errors. Talk about an expensive four-letter word!