Take it from the world’s greatest detective, Sherlock Holmes.
Step One: Obtain yellow spray paint.
Step Two: Use spray paint to draw a smiley face on a wall you don’t particularly care about. Omit the eyes.
Step Three: Use any instrument which projects projectiles (such as a nerf gun, as we want this to be safe and within a normal person’s budget) to project projectiles into the smiley face where the eyes should be.
Step Four: Repeat steps One through Three until your landlady objects.