It’s not easy being blond.

They have to live with all those unfair jokes.

Q: Why do blondes like lightning?

A: They think someone is taking their picture.

Now, it turns out blondes actually change the aptitude of men who meet them. And not in a good way.

In what is being called “bimbo delusion,” French researchers found that men actually get dumber when they meet a blonde.

The academics studied men’s ability to complete general knowledge tests after exposure to different women. They found that men’s scores fell after they were shown pictures of blondes.

“This proves that people confronted with stereotypes generally behave in line with them,” said Thierry Meyer, joint author of the study and professor of social psychology at the University of Paris X-Nanterre.

Two blondes lock their keys in the car. One of the blondes tries to break into the car while the other one watches.

Finally the first blonde says, “Darn, I can’t get in the car!” The other blonde replies, “Keep trying, it looks like it is going to rain and the top is down.”

This research is not going to help the poor fair-haired women out there. Not only are they stereotyped, there’s now science showing their effect on others’ mental performance.

Of course, the fact we can have a “blond moment” by merely looking at a photo doesn’t say much for men, either.

She was so blond, she told me to meet her at the corner of “walk” and “don’t walk.”

The psychologists who study this phenomena argue there are deep, complex and significant behavioral implications. People subconsciously change their thinking simply by looking at someone, based on everything from race to age.

For the long-suffering blondes, their current predicament goes back a long way.