Back in the day when I owned guinea pigs, I witnessed this phenomenon:

  1. Guinea Pig 1 would run around the confines of the cage and whack Guinea Pig 2 in the butt, coming to a halt
  2. Guinea Pig 2 would then take off, repeating Guinea Pig 1's actions, and hit it in the butt, coming to a halt
  3. Repeat
  4. They'd play it in the early morning often, usually at about 6AM.
    After that they were seemingly normal abyssinian guinea pigs.

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