Used when somebody sees the funny side to a tough situation, to remind not to take things so seriously
2010, Arja Salafranca, The Thin Line
The army teaches you to rely on yourself. It teaches you a whole lot of crap, like that some of those guys are real arseholes, and wouldn't stand a chance in the outside world. But you've got to laugh at that, man. It doesn't matter. It teaches you not to give a damn about anything, that nothing really matters.