John

Your coworkers sound like real gems. When you finish your radiation TX, you get the option to take that mask home with you. I'd recommend bringing it into your office and hanging it on the wall. You can tell them it's to remember all those nice relaxing naps you had on a nice slab of lead with the mask strapped to your face while getting zapped. Except it sounds like they'd be so clueless as to believe it.
Sorry to hear about your troubles. If you haven't already done so, read some of these back posts to see just how predictable and routine are these "slings & arrows" of outrageous coworkers - the common bad fortune of oral cancer patients.
Charm