I think I caught something from the gym by using their bath towels. The ones that people wipe all over their bodies and in all crevices. I couldn't find a towel at home so I had to borrow one of their's for my indoor trainer session where I sweat like a pig and drag the towel over every square inch of my head.
This isn't the first time is has happened either. Right now, I have feeling of both diarrhea and constipation.
Let that be a lesson to all of you. Bring your own towels.