We all know how annoying it is when pens go missing in the office. So, Paper Mate is encouraging you to 'catch a pen thief' on Facebook in a promotion for its Inkjoy brand. The campaign, via Energy BBDO, encourages you to submit images of suspected pen thieves to create 'Wanted' posters for sharing. Participants will automatically be entered for daily InkJoy pen giveaways and a chance to win a $2,500 prize. And there could be plenty of opportunity: Paper Mate's survey of 1000 Americans found all admitted to have stolen a pen at one time or other, whether accidentally or on purpose.