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e^x was walking down the street one day and met a polynomial running in the opposite direction.

"Wait, why are you running?" asked e^x. The polynomial said:

"There's a differential operator over there! It could differentiate me and turn me into zero!" And the polynomial continued running in fright.

"Ha ha," e^x said to himself. "I'm e^x! Let them differentiate me as many times as they want, it makes no difference to me!" So e^x walked on and reached the differential operator. He confidently introduced himself: "Hi, I'm e^x!" The reply:

"Hi, I'm ∂/∂y!"