I took my mother-in-law out yesterday morning.
Damn, I love being a sniper.
Sniper's Morning Outing
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Explanation
The humor comes from the unexpected twist. The first sentence makes it sound like the poster took their mother-in-law out for a friendly activity, but the second sentence reveals that they are a sniper and implies they shot their mother-in-law. It's funny because of the shock and the morbid implication.