The ultimate mathematical mood swing! On the left, we have e x - the only function that stays perfectly identical when differentiated, looking absolutely THRILLED about its mathematical immortality. Meanwhile, the constant function f(x) = 0 on the right is having an existential crisis because its derivative is always zero - completely DEAD on arrival! It's like watching the overachiever and the slacker of calculus class in their natural habitats. One function gets to be itself forever, while the other just... flatlines. 💀 Mathematical identity crisis at its finest!