I used this one at a Best Buy nearby (only I replaced 'Rape' with 'Attempted Murder' - I wanted to freak people out, not offend them). I placed it on a keyboard of a computer they were displaying. An employee noticed it, did a double take, and began reading.
She was visually disturbed, and took the note to another employee, who laughed and begain passing it around to other workers, who also got a kick out of it.
I got lulz, and the Best Buy employees got lulz. Win all around!