There are a few simple rules of first-world hygiene. Don't share needles. Abide by the five-second rule. And under no circumstances* are you allowed to eat in a public bathroom.

If your toilet was made by American Standard, Crane, Kohler, Eljer, Mansfield, St. Thomas or Gerber between 1997 and 2008, there's at least some chance it could randomly explode and cause "laceration injuries." So far at least 304 toilets have burst, resulting in 14 reported injuries.