Speaking of colored poop, this story was relayed to me.
Our store manager is a junk food junkie, I don't think I've seen him eat anything remotely healthy, ever. Twinkies have all kinds of new flavored fillings, which of course he had to try them. The blue raspberry flavored filling turned his poop blue. He was really freaked out about it. When he was telling his story, one of the other managers asked if she could see it. She was half serious, because really, who wouldn't want to see blue poop.