In this Straight Dope Classic, How do they get the M’s on M&M’s?, Cecil relates the following anecdote:
Does this count as the first Doper drive-by? 'Cos it would be nice to have it documented for posterity.
Cecil addressed a Mensa convention?!
We need to find someone who attended the speech and find out if he looks like Ed Zotti.
No way. Everyone knows that Cecil looks mostly like this
How m&m’s are printed
I assume that they are pad printed. This uses a silicone rubber pad to transfer the ink from the plate to the part, in this case the m&m’s are probably in impressions on a belt and printed a number at a time. One place to see more about this is www.printexusa.com
If you want to know more about M&M’s, try this-
put them m side up in a cup of water.
Wait about 10 minutes. T
hey will float to the top once the color coating is gone.
(My Grandpa used to work for Mars candy co.) Truly 
.
Whoops.
Oh my gosh… it’s the long-awaited, much sought, photo of Cecil! Discovered at last! Yep, I’m pretty confident that’s exactly what He looks like.
No, no, no! That’s obviously a picture of Pete Abrams of Sluggy Freelance.