Alright, so in college my friends and I also came up with a little comic series called "Circle and Square" which was also just three panels long. The similarities (all two of them) are striking. I felt this warranted a crossover.
Panel 1: Circle (a circle with eyes, a mouth, stick arms and legs, and a little hat) stands in one corner of the ring, across from Square (same as Circle, except he's a square). Circle is scared, Square is confident.
Panel 2: Circle, with his eyes shut in fear, slaps Square. Square is shocked.
Panel 3: Square is holding a smoking gun, rubbing his "face." Circle lies on the floor, X's for eyes.
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This is actually a lot more tame than how most of our comics ended. I now leave you to ask yourselves "Who let this guy in?"