"I shall not place a supply of "Sharpie" permanent markers in any whiteboard trays." Sharpies are fun. People take the "permanent" label much too seriously.

"I shall not place a supply of "Sharpie" permanent markers in any whiteboard trays." Sharpies are fun. People take the "permanent" label much too seriously. At work we have picture badges, at one point I was drawing mustaches on other peoples badges and watching them freak out. Alcohol will erase Sharpies as long as the surface is non-porous. (as they say in manuals, try in an inconspicuous place first ;-). One of my victims ran over to the computer room after I clued him in on the alcohol trick. (This was quite a while ago when we had tape drives and there were squeeze bottles of alcohol laying around for cleaning tape heads.) He grabbed the first bottle, squirted his badge, rubbed it, and nothing happened. Then he sniffed the liquid and realized he had grabbed a bottle of water instead of alcohol. Bonus.