I remember Mikey... and I still think of that commercial/Mikey every time I buy Life. When my daughter was little, she thought it was clever when she didn't want to eat something on her plate to say "give it to Mikey, Mom, he likes everything."
These started around 2000, so I know they aren't as classic as the other posted. But I think they are good for a laugh. Very few commercials today have any humor to brighten your day.