Back in the day, when Quantum Mechanics was just getting started, Einstein suggested a thought experiment that would disprove the Heisenberg Uncertainty Principal, and with that show Quantum Mechanics was inconsistent. Which it could have done if Bohr hadn’t responded in turn with his own thought experiment to win thought experiment round 1 and to keep quantum mechanics alive. Today’s physicists have taken a second look at Einstein’s argument, and say he could have been correct after all. Check this all out here.