Calvin's Sandwiches are very specific(as shown in the picture). The sandwich has to be like this:

  • 1.Chunky peanut butter only.
  • 2.Open faced.
  • 3.No jelly of any kind.
  • 4. Normal bread, no "weird" grain breads.
  • 5. Cut it diagonally.

The humor comes from this strip because Calvin's Mom did exactly all the things she wasn't supposed to.

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