Odd place for spare sandwich fixin's

While walking through the halls of the dormitory I'm currently employed by, doing my routine check for drunks and victims of violence, I happened to glance at one of the doors. Much to my amazement, this door had a slice of lunch meat pinned to it with a thumb tack. This raises two important questions for me. The first would be that of how the recipient would know where the meat had come from. I mean, there was certainly no signature. After that thought flits through my mind I immediately seize on the much more important question of "What the fuck is going on here?!" and other such important ponderings. College students are some strange people.