It was a really funny joke. Really, really funny. Alvin was at university studying design, and he rather fancied Dawn. Dawn was studying chemistry of some kind.
Alvin crept into Dawn’s apartment when she had the washing machine going, and tipped red dye into her laundry. Ha! Ha! Ha! Funny eh?
Dawn crept into Alvin’s apartment when he had the cake mixer going and tipped cow shit into the mixture. Ha! Ha! Ha!
Anyway, they never got married. In fact, they didn’t make it even to the engagement stage. Funny that.