Quantum mechanics' greatest prank! Electrons happily exist as probability waves until someone decides to measure them, then they're like "Nope, not today!" The observer effect is basically electrons being that friend who only dances when nobody's watching. Schrödinger's cat 🐱 would be proud of this level of petty. Next time your experiment fails, just remember—it's not you, it's the subatomic particles literally changing behavior because you had the audacity to look at them.