Thanks to television, film, and a never-ending supply of jokes, blondes have been dubbed dumb. In television shows such as "Three's Company," Chrissy is portrayed as the naive, innocent, and ditsy blonde girl who encountered many simple misunderstandings throughout the show. For example, when the police investigated a robbery at her apartment, he asked, "Who would leave an envelope marked 'Rent' with money in it in plain sight? No one's that stupid." Chrissy replied, "But we are!" Her stereotypical good looks also caused her to be lusted after by her male roommate, Jack.
Additionally, the film, "Legally Blonde" is also a play on this label. Elle Woods (Reese Witherspoon) is a pretty blonde who is very popular in her sorority and with the boys. But by seeming to break the stereotype, she gets into Harvard Law School (mostly to follow her ex-boyfriend rather than to become a lawyer, which in itself is another stereotype) but then realizes that she is more than just a pretty girl. Thanks to her knowledge of designer shoes (an additional stereotype), she is able to win the big lawsuit at the end of the movie, win the new guy (Luke Wilson), and become a successful lawyer. Although Elle breaks the premonition that blonde girls are not smart, the film further deepens the stereotypical view with Elle's stereotypical characteristics, such as her obsession with pink, her over the top outfits, and her puppy.
There is even a website solely dedicated to the apparent ditziness that is supposedly found in all blonde girls (http://www.coolblondejokes.com/) thanks to how they are portrayed by the media.