The mathematical drama unfolds! Our hero e x is being confronted by various differential operators asking "Why should I sail with any of you?" The punchline is BRILLIANT because e x is the only function that remains unchanged when differentiated! When the partial derivatives ∂/∂x, ∂/∂y, and other operators try to "kill" e x , they just get e x back! But wait! The integral operator ∫f(x)dx actually DOES change e x (into e x + C), so it technically "succeeded" in killing the original function! It's mathematical immunity with a single weakness! *cackles maniacally while scribbling equations*