This is a brilliant physics pun that plays on absolute zero! When someone says "I'm 0 K," they're not just saying they're okay - they're saying they're at 0 Kelvin, the coldest possible temperature in the universe where all molecular motion stops. Hence why they're "FROZEN" in the second panel! Fun fact: Scientists have gotten incredibly close to absolute zero in labs (within billionths of a degree), but it's theoretically impossible to reach exactly 0 K because you'd need to remove ALL thermal energy from a system. Even in the coldest parts of space, there's still about 2.7 Kelvin of background radiation!