Regularly tag the rear ends of your sheep.

I thought of going out for a ride, and was about to get up when I heard a footfall on the steps behind. I looked back, but there was no one. As I sat down again, thinking it to be an illusion, I heard many footfalls, as if a large number of persons were rushing down the steps.

10 December 2000, Gutterboy [username], “Moo arrested for boobfeeding a 6-year-old”, in alt.support.childfree, Usenet:

In some areas they have attempted to decasualize certain types of employment and to control street-trading by a local licensing system requiring juveniles to obtain their licences through the committees.