an e^x and a constant walked into a cave. the cave was dark and scary. out of nowhere, a derivative operator jumped out . the constant was frightened and yelled out "OH NO. I'M GONNA BE ANNIHILATED!" but e^x smiled and calmed the constant down, he said, "don't worry. i'm e^x." so, feeling confident, e^x walked up to the derivative operator and said, "hi, i'm e^x."
the derivative operator replied with a grin, "hi, i'm d/dy."
i laughed way too hard at that.