The limit of how far one can move away from a music device before being pulled back by the headphones because of unwillingness to take them off, usually due to fucking good music.
Person 1 "Hey can you get that for me?"
Person 2: "Why? It's just a few feet away from you"
Person 1: "But it's outside my music circle and I'm listening to this fucking awesome song right now!"
Doing the most amount of work in the least amount of time, using the least amount of effort.
Guy1 "Dude how does that guy get straight A's while doing almost no work?"
Guy2 "Idk, he probably uses the conservation of effort"
Guy1 -"Damn, i should start using that too"
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