The wise parrot0

THE WISE PARROT
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   Once a learned pedagogue went to a shop dealing in birds to cop a nice parrot.Selecting a parrot, he asked the shopkeeper," Are you sure this parrot does not scream or yell?"The shopkeeper responded,"Oh no,it is a very religious parrot.Look at those strings on his legs.When you pull the right string,it chants prayers and when you pull the left one,it starts humming melodious songs."
    Quite impressed, the pedagogue blurted out," What happens when you yank both the strings simultaneously?"
   Instead of the shopkeeper, the parrot screamed," I tumble down,you stupid nincompoop!"