You may have to think about his original idea for a few moments to appreciate all the ramifications of disrespect, taboo and mind-mess involved. Put simply, mail hair to your mark. Mail public hair or go to a barber shop and collect sweepings of hair. You can be subtle or you can be gross.
One of my milder friends gets back at club or disco bars with bad entertainment and heavy cover charges by pasting public hair on the mouths of women pictured on promo posters promting the band or singers.
If you’re a waitress, bartender or customer, you can plant pubic hair in people’s drinks and food. Think about the mental anguish. Always pick a good taboo like this for fun revenge on someone’s mind. Hair’s thinking of you, kid.