Mouthpipetting Memes

When your lab needs to explicitly tell students not to use their mouths as human vacuum pumps! The fact this sign exists means someone absolutely tried the forbidden lab technique of mouth pipetting—a horrifying relic from ye olde scientific days when researchers would literally suck up chemicals using their mouth to create suction. Nothing says "I trust my lab skills" like risking a mouthful of hydrochloric acid! The desperate PI who put up this sign has definitely witnessed some questionable life choices from first-year students who skipped safety day. And now we all know which university still has students attempting vintage 1920s lab techniques!