When?

The Perils of Grave Robbing

There aren't many of this class of old firearms from the 18th Century above ground. That's because they are firearms designed to take on grave robbers.

Grave robbers worked at night so as not to be seen, but this also meant that they may not see these guns mounted on a grave, and would probably not see the trip wires. 

Several trip wires could be fitted to the trigger mechanism, running in different directions. This not only covered a wide area, but it also meant that any one of these wires could swivel the gun in the direction of the intruder. (h/t)

They were referred to as "Grave Guns" or "Cemetery Guns".

Party?

Klu Klux Klan carnaval in Canon City, Colorado. 1925

Sometimes there is weird and sometimes weird takes on an entirely new meaning.