Messing with the bagger at your local grocer

1. Have a need to fill at least two shopping carts worth of groceries;
2. Begin unloading items from your cart onto the conveyor at the checkout. This should motivate the baggers to begin bagging groceries. Continue until at least half your groceries are bagged;
3. As if you just noticed the error, exclaim to the baggers that you wanted paper bags, not plastic.
4. Pause to enjoy reactions. In my case, the two baggers were split between shock and unamused disgust.
5. Let them in on the joke, so you don’t get hurt. They both laughed, but some of the eggs were broken. I suppose that's a reasonable penance.