Since I didn't really read the whole thread from the beginning, I will admit that I don't know if the commercial that I am going to mention was one that was mentioned already or not.
But, I am a fan of the Christian Borle "That's on eBay" commercial. Love the fact that it's a Broadway performer who is singing in a commercial rather then just acting or doing a voice over.
Borle's that's on Ebay commercial
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll