Your forehead is blazing to the touch, yet you feel shaky and chilled. Your body aches, and your head is no exception. You can't stop puking; you're dead tired. All of these not-so-subtle clues have you suspecting it's the flu.
Eww. Just eww. To be very specific, this little legal tidbit is to help you remember to not stick something in your mouth that has previously been in your butt. Just in case you might have forgotten that very basic lesson in hygiene.