True story:

I was working in a hospital about 9 or 10 years ago. A lady came into the ER complaining of stomach pain. Turns out she was in labor and didn't even realize she was pregnant. Her response...

"How did that happen? I've never taken any drugs!!"

Upon the doctor questioning her what she meant, she said...

"Well you know, I've never taken any fertility drugs. You have to take those to get pregnant, right???"

So, yes...there are those people out there that are completely clueless. Sad, but true.