Obviously, workplace safety is no laughing matter. However, the signs we use to maintain it often are. Along those lines, please allow me to introduce a few gems from the Stick Figures In Peril Flickr Group and to invite you to view the thousands more at the link.
http://t3.gstatic.com/images?q=tbn:ANd9GcQVbEhiyfV_-kx1yKjzlbd7mJyQOdhnmeupEu_Q7QsFB0sMsD4&t=1&usg=__xODod7PWlv9pds4oinIDsPNZVAI=w
http://news.cnet.com/i/bto/20080327/StickFigure-peril.png
http://i.telegraph.co.uk/telegraph/multimedia/archive/01450/sign13_1450506i.jpg