I guess my favourite is sort of embarrassing. I get that Windsor, Windsor, see what we have in store song in my head all the time. I loved the add when they had Buzz Shelby or whatever his name is singing along totally off key. I'm sure that's what I sound like in the car.
The one that bugs me right now is that one with old man Charlie bragging about his store that sells mattresses. I don't know if it's his voice or his know it all attitude but it just annoys me.