Because his uncles are aunts.
You don't - they're born that way.
Computers have them toad-ily confused.
The man replies: it's back there, I'm just going to get the water! (This is a true story, my uncle really said this)
They disguise themselves as uncles!
Mom: Well son, your aunt really loves flowers! Son: Mom, what do you love Mom: Richard, stop asking so many questions!
All of if its uncles are aunts!