I walk into my kitchen and notice my son sitting in the middle of the tile with his hands completely covering his eyes. I say "hi" to him and he doesn't respond. So, I pass him to finish washing up the dishes from breakfast. He is still sitting there when I'm done, although there is a faint sound of giggles. I say "hmmm, where could the boy be?" Silence. So, I ruffle his hair and say "Oh, there he is!" And, he very sternly says: "You cannot see me Mama. I'm invisible. See how my hands are covering my eyes? That means you cannot see me. I'm definitely in invisible mode."
I have been laughing about this ever since.