Physics students know the golden rule: c is the speed of light and it's CONSTANT. It's the ultimate cosmic speed limit! But this meme shows Einstein's reaction when someone dares to treat it as a variable. First he's concerned, then he's like "ACTUALLY, that's brilliant!" In E=mc², changing c to 2c would quadruple your energy (since it's squared). Einstein's having that eureka moment - "Wait, if we could somehow double the speed of light, we'd get FOUR TIMES the energy!" Too bad it breaks his own theory of relativity. That's the ultimate physics prank - messing with constants that shouldn't be messed with!