Matching shoes

I overheard her saying that, while being fitted with a colonoscopy bag at the hospital clinic, she told the nurses the joke someone had passed on to her – the one that said the worst thing about having a colonoscopy bag was the difficulty in finding matching shoes – only to learn that the very nurses she was talking to had made up the joke in the first place, and then, pleased with their efforts, had spread it through the community – very likely via those annoying emails that always come in clumps, as she said, and particularly on a Friday morning.