A guy took his blonde girlfriend to her first football game. They had great seats right behind their team’s bench. After the game, he asked her how she liked the experience.
‘Oh, I really liked it,’ she replied, ‘especially the tight pants and all the big muscles, but I just couldn’t understand why they were killing each other over 25 cents.’
Dumbfounded, her date asked, ‘What do you mean?’
‘Well, they flipped a coin, one team got it and then for the rest of the game, all they kept screaming was: ‘Get the quarter back! Get the quarter back!’ I’m like….Helloooooo? It’s only 25 cents!!!!!!!!!!!
Pure-Essence.Net 
In my impression of western culture, blonde hair stands for attractive or elite. But why are all the blondes so stupid in jokes?
Because at least in America, blonde are stereotyped as stupid. Just a stereotype of course 🙂 I know many blonde who are very smart.
Recently I’m watching the TV show ‘gossip girl’. As I notice, most males tend to have darker hair, while female lighter. So I believe that it’s a criteria of good looking in present communities.