This plugin allows server admins to troll players by wreaking havoc.
The base command is /havoc. The format for a havoc command is /havoc <target> <type>. The types of havoc are ghasts, creepers, fire, kill, lightning, hide, show (just to be nice), and ultimate. Each of these types of havoc are guaranteed to annoy your helpless players.
To allow a player to use this plugin, give them permission havoc.use.
Essentials is required for this plugin, because it uses the command /spawnmob. Essentials can be download from here.
If you are interested in the source code, it can be found on GitHub, here.
*DISCLAIMER: Some types of havoc may be dangerous to your world. YOU HAVE BEEN WARNED!!!*