Going back to the series of ads that (although maybe not great) inspired me to want to get into advertising:
The magnificent Tango ads of the early 90s were one of those that completely changed the way I (as a 8/9 year old kid) thought about the product; and in many ways, completely changed what I thought about advertising. It felt like an ad and product that belonged to us, it was fun and silly and weird.
Now you all know the ad, but to show you how good it was; here is an example of the previous campaign from 1989 (second ad in)...oh dear.
Another ad which will forever be in the heads and stomachs of people my age was probably the best milky way ad ever. Considering I hadnt seen it in about 8 years when I first saw it online, it was a testament to it that I knew all the words perfectly.