Hahaha yeah I was just going to say Mike is shameless in his diarrhea claims, a quick trawl of his posting history here would suggest he is a bit obsessed actually. But he kind of cleared that up himself.
The closest I can do is some generic "tummy bug" and let people fill it in, otherwise I'm too paranoid that everyone is just picturing me incapacitated on the toilet all day.
Really I just say I'm sick, I've never actually had to elaborate.
I must say it depends on where you work, that excuse doesn't fly in healthcare, they want MORE details