Has something surprising and weird happened to you when you didn't expect it? Like finding your cat in the shower, or seeing a fly that keeps bumping into a window over and over, or your dog wiping it's butt on the carpet? Surprising and weird things make us laugh.
Once, I was by a fish and chip shop! There were some fence posts with wire on them, probably owned by a farmer. We were sitting at a table having some drinks. We saw just one pukeko standing there minding its own business. Then another pukeko came and scared the bejesus out of the first pukeko by running past . As the pukekos were chasing, one of them scared a sheep. It ran away It was so funny.
Sometimes weird things can happen that make us jump with laughter and this was one of them.