Lol. My 7yr old daughter gets SO perturbed over the "monster" issue. She's quite sensible, you see, and cannot BEAR hearing any nonsense about monsters. Which, naturally, gives me cause to tease her, as much as possible. I mean, this child will argue herself blue in the face, at the very SUGGESTION that monsters are real, lmao.
The other night, I swore to her that all of her dolls came to life while she slept, and moved around the room. She didn't let up over that, for a good hour.
She's just far, far too rigid about this sort of thing (and well...every sort of thing, heh), so we like to shake up her thinking, now and then. And while she's excellent at arguments, Mom has been doing it SO much longer, that I take great pleasure in occasionally ruining all her Good Logical Sense.
We've got her watching The History Channel's "MonsterQuest" now, ever so often, and she's just horrified to see any evidence that such things could be true, much less entire teams of intelligent adults, hunting for Monsters. It's not that she's scared of monsters, more that she just HATES the "silliness" of it all.