Any of those Yellow Pages adverts with James Nesbitt. The haircut one, the snarling dog one and especially the one where he goes to an Elvis party dressed as an elf, saying his invite said "Elves".
Years ago, I used to love the jingles that
everybody sang.
"Omo Adds Brightness, brightness brightness",
"You'll Wonder Where The Yellow Went, when you brush your teeth with Pepsodent",
and my favourite,
"O-o-o-o-o-o-oh The Esso Sign Means Happy Motoring, call at the Esso sign - for Esso Extra"