Susan was reading this post by NieNie which made her recall when the UPS man saw her naked.

Stop her if you've heard this story already.

Well, Susan was totally alone in the house.

Fresh from the shower she went into the kitchen to replay a telephone message. The sunlight was streaming through the windows as she bent over the answering machine,

ass to the door
and heard a quick knock.
She turned around just in time to see the UPS man walk away.