How to turn urine blue

My interest in this subject began from hearing a rumor that there was a chemical you could add to food that would make someone’s urine turn blue, as a prank. The person I heard it from had no idea what chemical it was but insisted that it existed. I, of course, being of the Google generation, searched immediately for turn urine blue and lo and behold, the second result was a Wikipedia entry for a chemical called Methylene Blue. I knew I had to have it.

Yes, this is gross. But interesting nonetheless. Simply consuming some Methylene Blue powder can turn urine blue for up to two days. Sounds like good prank material.