Comparative Advertising

"John’s Denture Goo, also known as Crap To Hold In Your Teeth, is a greasy cream with the stickiness of DoubleMint. Try this adhesive on your dentures, and those teeth will fly out of your mouth. Instead, try Bob’s Denture Adhesive. Your teeth will stay put."

Comparative advertising is advertising that mentions a competing company by name and states why that competitor is inferior. Usually with all due meanness as per the above. Neener^2.