Two couples had gone on holiday together. After many bottles of red wine, for inscrutable reasons, they came to the conclusion that they would try to swap partners for one night. As said so done. Tom took Glen's wife into his hotel room, and vice versa.
But before they went into their respective rooms, Tom and Glen entered into a so-called butter pact.
It involved sticking the knife in the butter during breakfast to show how many times they had had sex with the other's wife without saying it directly.
Tom was very satisfied with the situation, as he was aware that his wife was menstruating. He plunged the knife into the butter three times.
Tom smiled and looked smugly at Glen. But the smile quickly disappeared when Glen took the butter knife and plunged it twice into the raspberry jam and three times into the Nutella bucket.