At a big cocktail party, an obstetrician's wife noticed another guest, a big, oversexed blonde, was making overtures at her husband.
But it was a large, informal gathering, so she tried to laugh it off, until she saw them disappear into a bedroom together.
At once she rushed into the room, pulled the two apart and screamed,
"Look, lady! My husband just delivers babies, he's not supposed to INSTALL them!"