My daughter is now 2.8 years old.
Some time ago, she had the habit of sucking her hands in her mouth, and I, of course, chased her for that.
When we wash together in the morning, she washes over the dishwasher and I over the bathroom.
So, today we wash, I turn to her at some point, and she has a hand in her mouth, I look at her awful and silent. She has such a stunned look and after a second says: "I am my tongue".