I could also add some stuff from when I used to do first aid for various groups, such as:
* Do not attempt a mock "execution" from 3 feet away, using a firearm loaded with black powder.
* It is not a good idea to try to look into the vent of a cannon when the cannon is being fired.
* Attempting to slice salami when drunk, especially using one's foot as a cutting board, is not a good idea.