In Chemistry a few months ago, we had finished "working" and were just shooting the breeze. Somehow, the conversation swung around to WWII. While discussing the fall of Germany, one of the girls spoke up:
"Um, guys... what's D-Day?"
Cue giant eyes and silent stares for a good five seconds.
Also, a girl saying in the middle of World History:
"Wait, the Titanic actually happened? But it's just a movie!"
Geez, high school students can be idiots sometimes...