We had an apparently disgruntles employee at my old job that started a fine little collection of them on one of the urinal stall walls. After about a week of this there was a bout a 12" square section covered. The janitor was pissed, so he taped a little cardboard frame around them and posted a note saying "As much as I appreciate this fine dried mucous collection, I believe it would be best if this was moved to a more appropriate location." It was pretty funny. It stayed up for about a day. The sad thing was, we all knew who was doing it. It was pretty obvious. So me and a bud decided to take care of it. We took a piece of tacky mat and stuck it to the stall wall, and then peeled it all off. The frame, the note, the boogs, all came with it. We then neated placed it on his desk for all to see. Fucker.