The punchline works on multiple levels of chemistry brilliance! Helium (He) is a noble gas, meaning it has a full outer electron shell, making it chemically inert - it literally doesn't react with other elements. So when the barman refuses service and "helium doesn't react," it's both a chemistry pun and a perfect personification joke. Noble gases are the chemical introverts of the periodic table - they're perfectly content being alone and avoiding interactions. This joke deserves a gold star... or should I say, a group 18 element star?
Noble Gas, Noble Response

helium-memes, noble-gas-memes, chemistry-memes, pun-memes, periodic-table-memes | ScienceHumor.io