Main Cross Over Punchline Discussion

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mat
Topic
04:25:25 PM Nov 1st 2017
Why is it a punchline? That makes it sound like a Crossover Brick Joke. Aren't tropes like this usually "X Gag", making this "Crossover Gag"?
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http://tvtropes.org/pmwiki/remarks.php?trope=Main.CrossOverPunchline