A few nights ago, I was listening to Russell and Silas chattering together in bed. They were pretending there were monsters under the bed, a la Calvin & Hobbes.
After a few minutes, Silas asked Russell, "But there aren't REALLY any monsters, right?"
"Right," Russell reassured him, "the monsters aren't real. They're just pretend."
"But what if MOMMY AND DADDY aren't real?" asked Silas.