Ka-pow! Pop art fonts are fun to use with comic style designs. The style was made popular in America in the 1950s. "The movement presented a challenge to traditions of fine art by including imagery from popular and mass culture, such as advertising, comic books and mundane cultural objects. One of its aims is to use images of popular (as opposed to elitist) culture in art, emphasizing the banal or kitschy elements of any culture, most often through the use of irony. It is also associated with the artists' use of mechanical means of reproduction or rendering techniques. In pop art, material is sometimes visually removed from its known context, isolated, or combined with unrelated material. [Wikipedia]
In design, pop art designs tend to take on the flavor or old style cartoons or Warhol-style imagery.
Check out ten free fonts you can use for pop art design and some examples of pop art in modern advertising.