Just check ONE

When filling out a survey or questionnaire and you come upon a question that is followed by two boxes, one of them labeled yes and the other no, you need only check ONE box. If you check both it could cause great confusion [and irritation] to the one who is recording the results of the survey.

Imagine if in elementary school Little Jenny would have sent this note back to Little Timmy with both boxes marked...

He wouldn't know whether to rejoice or cry his eyes out. He's probably end up in rehab 20 years later whining about how girls are so confusing and he doesn't understand why they don't like him...

I'm just saying.