Bra Oupa was having an affair with the woman, Sophie, from next door.

One Friday morning he lies to his wife he is going to Durban for a seminar.
He packs his laptop and bags and tells his wife she won't find him
when she comes back from work, and slinks next door to Sophie's house.

It's now the following morning, Saturday, and he's smiling after a lovely
Night with Sophie.

Wearing his gown, he goes to the bathroom and, to his surprise,
through the window he sees a man walking around his house
wearing the other gown he left at home.

He screams: "Hey, jou moer! Wat maak jy by my huis?"

The man shouts back: The man of this house is in
Durban as we speak."

Bra Oupa replies: "Julle gaan KAK as ek terug kom van Durban af!"