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You get it at first, then you're lost, then you suddenly get it again, and it's like a slap to the face but in a funny way.
I got the math, then I didn't, then I did and it was the worst thing ever.
She explained the joke, then I got it, and it was like I was slapped by a chicken.
He taught me the lesson, then I forgot it, then I remembered it and it was like a punchline from hell.