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Here is one having a similar punchline, but, in my son's opinion, with a MUCH better joke:

A constant function and an exponential function are walking down the street and they see a partial derivative. "Go over and talk to her" says the exponential function. "I cant, she'll differentiate me and I'll disappear!" says the constant function. The exponential function says "Okay, I will then. I'm e to the x!".

So he goes over and says "Hi, I'm e to the x!"

The partial derivative says "Hi! I'm d/dy"

Yeah! (Also celebrating said son's graduation Master's Math at Exeter, so I am going to be telling all and sundry lame math jokes for about a week!) Yeah! Yeah!