OK, so I put this down to hormones....

When I was pg with DS I was at my sister's house with the extended family. There was a documentary on telly about a school for vision impaired children. They focussed on a little boy of about 4 years who was completely blind. They were interviewing his parents and cut to footage of the little bloke sitting on a seesaw - backwards. All I could think was, 'Omg, the poor little bloke is blind, he doesn't know he's facing the wrong way!'. And it appealed to my hormonal sense of humor. I laughed until I cried, rolling around on the floor with my big belly, absolutely unable to stop. I laughed until I wet myself a little and choked and had snot running out my nose. While everyone stood around and looked at me and wondered why I was laughing. My family still talk about it.

Please don't hate me - I know there is nothing funny about being vision impaired and quite likely the little bloke just liked to ride backwards. But at the time... funniest thing I had ever seen.