Stress.
You pick up a hitchhiker, a beautiful girl. Suddenly she faints inside your car and you take her to a hospital. Now that's stressful.
But at the hospital, they say she is pregnant & congratulate you that you are going to be a father.
You say that you are not the father, but the girl says you are. This is getting very stressful,
So then...... you request a DNA test to prove that you are not the father.

After the tests are completed, the doctor says that you are sterile, and probably have been since birth.
You are extremely stressed but relieved.
On your way back home, you think about your wife and 3 kids at home.

NOW THAT'S STRESS!!