Three couples marry and stay at the same hotel for their honeymoons, where they are taken care of by Dave the bellboy.
The first man married a nurse. Dave thinks to himself, "Nice, nurses are known to be hot."
The second man married a telephone operator. Dave thinks to himself, "Telephone operators have sexy voices."
The third man married a school teacher. Dave thinks to himself, "Poor guy, teachers are too strict."
The next morning, Dave reports to work and gets a room service call from the nurse's husband. He sourly says, "Don't ever marry a nurse. All I heard last night was 'You're not sanitary, you're not sanitary.'"
Later that afternoon, the teacher's husband calls and happily says,
"When you marry, be sure to marry a school teacher. All I heard last night was 'We are going to do this over and over until we get it right!'"