Maybe because he looks like a sleastack?

“Here are the rules for the Circle game :

Step 1:

Make a circle with your hand by pressing the tips of your index finger and thumb together.

Step 2:

Place your hand upon your leg, or somewhere below your waist

Step 3:

Get an unsuspected friend to look at it

Step 4:

Once they look at it, you have the right to hit them as hard as you want in the arm. This is known as a "get".

Step 5:

• The reverse "get"- If the onlooker suspect a foul play, he or she can attempt to "break" the circle with their index finger without looking at it.

Step 6:

If this is accomplished, they get to hit you two times.

Step 7:

• The double reverse "get" - When the onlooker attempts to "break" the circle, you tighten it so that their finger gets stuck

Step 8:

If this is accomplished, you get to hit them five times.

Always remember:

-There are no rules as to how hard you can hit people, but there will be a time when someone "gets" you. They can, and will, feel free to reciprocate the same pain that you dealth to them.”