I'm officially obsessed with these crazily awesome Handy Notes.
Not only are they sticky notes that are shaped like hands--you can also make quite the point: give thumbs up, point at something, and even a couple I can't mention. The added flourish of being able to shape "your hand" into a bunch of helpful hand signals just tickles my fancy.
Fold the hand into a pointing gesture before adding your passive-aggressive warning. Got to get your mum to call you when she gets home? A well folded 'call me' hand gesture with your number on should do the trick.
The possibilities are endless. Ish. Well, as far as a note pad goes.
Each pad is about $8.