This existed.

I was a dispatcher for one such "service" in college in the early 1970s. One of my friends was almost arrested for making a "delivery."

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Dial a pie appeared on occasion in the 70's/ 80's. Always the same premise, wrong person gets pied. It would have been great on "Friends"or "Everyone Loves Raymond". Rachel or Debra. Btw how did Suzanne Plechette escape getting pied?

I'm old

I've had Pie-o-gram in several of my stories but never knew it actually existed anywhere!

Yeah, when Barbara Mandrell and her sisters had a tv show, they had a scene where Barbara and one sister got hit when the sister wanted it to be her sister.

Famous line, after Barbara got hit with the pie, was "wrong Miss Mandrell!"
"Oh excuse me," the pie guy said and then hit her with a pie.

HA!