Say, "Please may I have it?"

Elisabeth loves to hand me my towel after I have showered. We have a routine where she plays in her room during my shower, and as soon as she hears the shower stop, she races in to hand my towel into the shower. A few days ago I heard her little voice outside the shower:

Would you like your towel?

"Yes, please," I responded. She returned,

You need to say, "Please may I have it."

She's holding me to my own word!