I hate my wife.
*cue laugh*
I hate my wife.
*cue laugh*
Listen here, buttercup. So, the joke is that this dude is saying he hates his wife. It's funny because marriage is supposed to be all sunshine and rainbows, not a daily dose of "ugh, her again." And that little '*cue laugh*' part? That's like saying, 'Hey, this is where you're supposed to chuckle, you simpleton.'