Move to an open window. This way you save your wall but you may want to warn passersby first.
I wish I could (or not) remeber what it was...but I sprayed everything, the monitor, the damn wall. Then, I remembered Craguy bitchin' I had done it to him and with another mouthful of coffee, hit it all a second time, laughing at the irony.
The saving grace is that the wall is chocolate brown, so it took my wife a few weeks to even notice it. (I carefully rearranged somethings on my desk to hide it) Now that she has, I will be repainting. And of course, once I get all the paint stuff out...I'll be repainting half the damn house.
You know, I really need to try and remember what it was and who posted it so I can 'Thank' them properly.