The SI Unit Catastrophe

That moment when you're absolutely crushing a physics problem, feeling like Einstein reincarnated, only to realize your answer is off by a factor of 1000 because you forgot to convert from pounds to kilograms! The train of your perfect solution derails spectacularly while the correct answer (that tiny mouse of SI compliance) smugly watches your imperial unit disaster unfold. Every physics student has experienced this special flavor of academic trauma where a 30-minute calculation collapses because of a simple unit conversion. The professors who deduct full points for this are probably the same people who laugh at Tom & Jerry cartoons for their "unrealistic physics."