Her stickers are smiley (and non-smiley) face stickers. But she almost ALWAYS chooses the smiling ones and will avoid all the funny faces, angry faces, etc.
But tonight after she brushed her teeth, this was the conversation:
Me: "OK! Let's get a sticker for your chart! Which one would you like?"
(She points to one with a frowny face)
Eden: "The sad one...cause he's sad he has to go to bed."
Oh, she knew it was bedtime and though she was being very nice about it...she was sad, just like the sticker.