By way of Al of Chicago:

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Brown, yellow and green had been there since the beginning. For the most part, red had been there, too. But tan was cut out and replaced with blue.

Along came some scientists. They cut off a corner and removed a single sample. They cut it into three parts. They looked at the parts. Then came the announcement. It was written on a big blackboard. BLUE!

All M&Ms are blue.  It doesn’t matter what you think you know, we have examined one sample and are 95% certain that all M&Ms are blue.

Here ends the metaphor for the carbon dating of the Shroud of Turin.

Editor’s Note: Chart is from Wikipedia. It shows the history of M&M colors.