Here's a suggestion: When checking out of restaurants, don't take any free mints if humans take them out by hand; because, the mints may be contaminated with URINE.
First, unwrap the mints before you eat them.
Second, don't take the big green or pink mints from the men's room. EVER.
" ... the mints may be contaminated with urine"
Don't forget about the peanuts in the bowl on the restaurant bar counter.
Just to clarify - it's OK to eat the mints that space aliens take out by hand, their fecal and urine residue doesn't have an effect on us.
(just latching on to the use of the word 'human' and poking fun)