I love everything about these ninja-inspired throwing star sticky notes from ThinkGeek. Everything except the fact they're made from black paper, making them next to impossible to write on with anything other than a special marker.

Available in three styles of throwing stars plus a bona-fide ninja ready to do combat, the notes appear to be only sticky in strategic spots, letting you stick them in a way that makes them appear to be lodged in the surface.

It's a clever gag, but $8 for just 24 stickies is a little steep. Not to mention you'll need to get one of those fancy silver inked sharpies to even use them. [ThinkGeek]