Oh jeepers! - definitely not work safe. My boss was pretty much directly behind me when "MOTHERFUCKING LASERS" appears on my 24" screen in massive letters.
This is the one time I'm glad the place I'm working is so backward web-wise, as the lasers didn't work - no CSS3 for me! - and thus my screen wasn't turn into even more of a profanity-emblazoned eye-magnet.
So thankfully, she didn't notice. Phew.