Blonde...Infant Scale
At a pharmacy, a blonde asked to use the infant scale to weigh the
baby she held in her arms. The clerk explained that the device was
out for repairs, but said that she would figure the infant's weight
by weighing the woman and baby together on the adult scale, then
weighing the mother alone and subtracting the second amount from
the first.
"That won't work," countered the woman. "I'm not the mother, I'm
the aunt."