Celebrities who have been multi-millionaires for the past decades advertising products, shops, and services which they - obviously - have never used and would never use, in the belief that we'll all rush out and buy those products, use those services, and patronise those shops just because they're celebrities.
Michael Parkinson on the Life Insurance ad really pisses me off - "You really can't buy better ... and you get a free pen just for applying".
Going further back we had Jimmy Tarbuck who's been a multi-millionaire since the 60's advertising Iceland. I'll swim the channel with Marsh on my back, plait sawdust, and weave water, if the over-fed twat had ever eaten anything from Iceland in his life.
Celebrity advertising - Bah Humbug!!!