Not that I necessarily think they're trying to discriminate against people with autism giving blood, but there's one of these on the blood donation intake questionnaire.
Intake Questionnaire: In the last year, have you used any illegal drugs via needle injection?
Me: No.
IQ: In the last year, have you had sex with anyone who uses illegal drugs via needle injection?
Me (married): Well, it's not as if I can keep an eye on my wife 24/7... you know what, I'm just going to mark it No.
IQ: In the last year, have you had sex for money?
Me: No.
IQ: In the last year, have you had sex with anyone who has had sex for money?
Me: I'M TELLING YOU, I CAN'T KEEP AN EYE ON HER AT ALL TIMES, SO FUNDAMENTALLY I CANNOT GIVE A CERTAIN ANSWER TO THAT QUESTION!