Snickers candy bars have been around for over 85 years, and, like their M & M/Mars brethren, there've been some animated spots to promote the product.
This little piece comes from sometime in the 60's. The only thing I'm sure of is that the voice of the talking candy bar is that of Paul Frees (who else?).
Of course, the singular packaging has shrunk over the last 50-odd years, and over the course of that time, there's been an expansion of Snickers into a whole line of candies. When Mars decided to revive the Marathon bar a few years back, it was rebooted as an energy bar, and added to the Snickers family. Curiously, Snickers was known as Marathon for many years in the UK. Unfortunately, it appears that Snickers Marathon is no more.