A tactic in Half Life which involves hiding whilst two people fight, then jumping out when they're at 10% health and killing both of them, named after it's creator.

In terms of respect for such methods of play, it's rated well below that of "Camping" and "Spawn Killing"

Running for exercise and picking up trash you find along the way. It's good for the body, mind, soul, and environment! Started in Sweden but is making its way to the U. S.