Dancing Wretch

In the COG spawn's Home Goods area, press the fire alarm on the left wall.

Go right into the electronics section. Shoot open the box blocking a door to find an extinguisher. Pick it up.

Head to the Pharmacy spawn (Locust). In the back, use the extinguisher on the burning fire alarm switch. Outside the metal bars, a cart with a Red top hat will appear. Shoot it with the Hammerburst until it explodes.

Go to the pair of windows on the right outside the Pharmacy spawn. Stand in front of the left window and aim into it. Another Red Hat will appear; shoot it until it explodes.

Enter the checkout area. A truck will catch fire; use the extinguisher to put it out. Your character will comment, "Throwing Smoke."

Go to the bathroom in your spawn area. Shoot Griffin's cane hanging from the ceiling until it retreats.

Return to the Electronics area. On the left of the back door, a microwave is on fire. Put it out. A smoke grenade will go off behind the doors. Look through the window to see a Wretch wearing a top hat and cane, dancing.