That was when Captain Green Sleeves began chasing the sea bird.
Around the corner the bird flapped out of the sheltered part of the docks. At the edge the bird took a turn and flapped right into the boat. The cat came directly after. The boat bounced twice, a small bounce. The cat chased the bird further onto me and for some reason the Captain leaped up onto the top edge of the mattress.
As a result of physics, the mattress toppled over onto the space heater.