It's the second best thing you can do with your lips
Get your mind out of the gutter, I think the #1 thing is to whistle.
Colorful plastic 7.75 x 10.5" sign with punchouts for hanging, or use double-backed tape.
The image shown above only conveys the idea, the actual product is colorful and sharp with no smudges, and does NOT have THE RESTLESS MOUSE printed on it.