Well here is your daily dose of gross. Recently, an "unusual substance" was found in some of the soap dispensers in the bathrooms of Metro Airport in Detroit. Yep, you guessed it, it was likely bodily fluids. 

After the discovery, Metro Airport employees made the switch to tamper-proof dispensers in the bathrooms. Employees did not have the substance tested as it was pretty apparent that it was spit.

People are just nasty.

Source: WDIV