Assignments and the USB Headache Detector

Pia tries different ways to avoid doing her 'assignments' (reading, writing, math exercises we ask them to do)

One day, while Dominic and Pia were trying to do their assignments:

Dominic: Daddy, my head is painful.

Daddy: Go to bed and rest (he's been feeling unwell the past day).

Pia: (notices Dominic got off doing his assignment, says hesitantly) Daddy, my head is a little painful too.

Daddy: (suspicious) Are you sure?

Pia: (weak nod)

Daddy: (picks up a USB memory stick).  Do you know what this is?

Pia: No.

Daddy: This is a lie detector.  If you are telling the truth, this will light up. Are you sure you have a headache?

Pia: (weakly) ...yes...

Daddy: ('sticks' the USB into Pia's ear)....Hmmm see it doesn't light up.  Finish your assignment.

Pia: (slinks back to her desk) Hoookaayyyy.....

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