I play therefore I cannot

Pia is playing with her toys in the bedroom. It's almost time for lunch.  It's her job to set the table for lunch:

Mommy: (in the kitchen) Pia, set the table.

Pia: (no response)

Mommy: Pia, come on now. Set the table.

Pia: (no response)

Daddy: (angry tone) Pia! Are you going to set the table?

Pia: (from inside the bedroom) I AM ! ...but I cannot.

... and then she goes on playing.

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