So x and e^x were walking down the street, and they got onto the subject of derivatives. X was like "Oh gnoes, derivatives would like, make me cease to exist." In response, E^x was like "Derivatives can't even touch me... I must be invincible, like superman or something." And so x and e^x continued to walk down the road till, what do you know, a derivative jumped them. X, and promptly wetting himself, goes running much like a little girl who has just seen a half spider half rat which is about her size, that is to say, x faints on the spot. But e^x is all like "You trying to mug me. Eh, do your worst, you can't even touch me." To this, the derivative replies, in a strong french accent, "Ah Monsieur, you don't understand. I am d/dy."
