If you recall, last year for St. Patrick's Day we conducted a Green Beer Experiment. This year we again performed this testing to verify the results were reproducible. However, after several green beers (and some pink and orange ones due to 'grab bag' m&ms) we decided to plop one in the scotch.
What turned out was something that may be useful on Halloween. The color seared onto the bottom of the glass and kind of stayed there. The white shell of m&m still remained in tact, almost like an eyeball. It was pretty skeevy. And when the scotch was gone? My dad reported the peanut had gone soft.