In UT2004, I have the Ballistic Weapons mod which gives a whole bunch of neat weapons and such. One such weapon is the tripmine.
The BW tripmines are awesome, as they can be triggered manually, and can be activated/deactivated remotely.
I was rigging up a route often used by the enemy with tripmines, and once I was done I turned them on.
I forgot to move first, and I was standing right in the way.
Boom.