To be fair, when I slung pies in a college town back when, one of the night guys was a local shroom dealer and would take orders for "custom" pizzas. We didn't do delivery, so little bundles of fun went out the window inside the pizza boxes (tucked in with the parm & chili flake packets) on the regular.

There's a german stoner movie called Lammbock which covers exactly this scenario. Check it out if you can.

That happened a lot in NY too, I think we called them sticker shops