Graffiti at the Met

I went to the bathroom during the first intermission at tonight's performance of Rigoletto by the Metropolitan Opera Company. All of the urinals were occupied, and even though all I had to do was pee I decided I'd rather wait for a stall than wait until the requisite number of urinals were abandoned for me to properly take my place (keeping in mind the essential one-urinal buffer zone). I'm glad I did. Inside the door to the stall I occupied was a sign that originally read "Please do not throw paper towels in the bowl." Somebody had defaced the sign by adding "to" after "in," so that the sign was now grammatically correct: "Please do not throw paper towels INTO the bowl." Upon exiting the stall I quickly surveilled the others around me; they each had the same sign, but only mine had been corrected, indicating that it was the work of some vigilante grammarian and not some Met-wide policy of cheap correction. To whoever you are, you Zorro of prepositions, wherever you may be, I salute you!