Today's Penny Thought is brought to you by: arachnophobia.

Penny: Mommy, there's a spider web!!!
Mommy: It's pretty neat, huh?
Penny: No, I just break them.
Mommy: Don't do that.  Spider webs catch flies, then spiders eat flies, and flies don't land in our food.
Penny: AND tarantulas catch AND they have poison!
Mommy asks Daddy: What has she been watching???
Daddy: Some documentary about poisonous tarantulas in the Amazon...