Office Supplies Crossbow Admin at 8:00 am June 13, 2014 Lifehacker Dave Hax shows you how to impale co-workers with biro refills. likecool/boredombash Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Share on Pinterest (Opens in new window) Pinterest Sponsored Link Related posts: The Point Of It All Intentstinal Just Nuts Animation: The Ballad Of Holland Island House