The other day, my sister was over and we were talking in the living room. Lily came in and interrupted us and I reminded her not to interrupt. She stomped away and I heard her slam her door. When I went to check on her a few minutes later, I found this on her door:

She later amended it to say, below the "do not entr," "I am mad but you are bad." It's hard not to smile when she does stuff like this.