Dave was a bit of a nut who enjoyed making obscene phone calls.

His biggest pleasure is making such calls to kindergarten teachers.

He’ll find a lonely telephone booth, dial the number of a teacher, and exclaim -

“Is this Mrs. Jones, the kindergarten teacher at P.S. 41?”
When the teacher answers yes, Dave goes into his act…
“Wee-ee, poo-poo ca-ca!”