A blonde walked into a pharmacy carrying a baby and said to the assistant, "Do you have a set of infant scales to weigh little Giacomo?"
The assistant apologetically said that the infant scales were out for repairs. "But don't worry - we can still weigh babies here. We just get the mother to stand on the adult scales with the baby in her arms, then weigh the mother alone and subtract the second amount from the first."
"Oh dear, that won't work for us," said the blonde. "I'm not his mother, I'm his aunt."