Sometimes when others use the bathroom before you they can leave behind a nasty surprise. As in a foul odor. If this sounds like a situation that you encounter regularly, check out the Toxic Gases Toilet Caution Cone. It will provide fair warning for others to wait a while.
Be nice and leave a warning so that others aren’t overcome by hazardous vapors. Keep the toxic toilet fumes well identified! “Give it ten minutes!” It’s good advice.