very often, people (mostly women) enter the second or third stall in a public bathroom. maybe she believes it to be the cleanest of the stalls. maybe she doesnt think about it at all.
this is silly, skipping the first stall, mostly because everybody else is also entering the second or third stall, thinking (or not thinking) the same thing. the second or third stalls are the dirtiest of stalls.
do not sit on the seats.
do not breathe in too deeply.

#1!