This is a plugin for Bukkit/Spigot/Paper/etc. Minecraft servers.
It adds a command /russianroulette (aliased to /rr).
When executed, there is a 5 in 6 chance of a dramatic Click... and a 1 in 6 chance of the player being permanently banned from the server.
The command requires the russianroulette.command permission (which should be enabled by default.)