I remember when I was five, they advertised M&M's as 'melts in your mouth not in your hands. Every time I'd eat them, my hands would be coated with the orange, yellow, etc. candy on the outside. It seemed like false advertising. But, as a little kid I was messy and I'd lick them out of my hand. The saliva made the M&Ms melt.
Considering kids liked candy, it was not a very accurate ad.