I don't even remember what product it was, but a bunch of businessmen are siting around a table looking at a gizmo like contraption. The dialogue went something like this: It's supposed to make people tell the truth. That do you think Ralph? I don't think, I'm just a yes man. It works..
Close second is several iterations of Clara Peller WHERE's THE BEEF?
Anyone remember Bob Newhart's parody on this commercial on his "Newhart" show, where he is in the little boy's role and a basketball player tosses him his game worn sneakers? lol
Here is my favourite TV ad ever made. It's an ad for the national milk board in Finland and features Lemmy. It was filmed just days before he passed away in 2015.