Put a group or a small number of people in sauna, make sure it's nice and warm. Then open up the door and spray pepper spray(Fox Brand) in the eyes and bodies of the people inside. The heat will increase the pain of the pepper spray, after they snot and hack and gag on it for a few minutes, let them out towards a shower or with a shower in close proximity, they will automatically go jump in the shower due to them thinking it will take off the pepper spray, but it as well as the heat will increase the pain and make it run down their body making the situation worse.
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