The Geology building, GEO, at the University of Texas at Austin features some innovative topical graffiti. The following is on the mens' room stall, third floor, furthest from the door:

We need some negative graffiti - Electrons Rule!

Next time I see a geology major I am going to hit him with a rock

Got grout?; Sauergrout; Have a grout day; Grout it out!; Do I have a rash on my grout?; Look on the grout side; The Grout Goblin; Grout, grout, let it all out!; Grout of the devil; Grout, the Other white cement; Grout expectations; Groutus interruptus; Get your kicks, Groutse; Grout Wars' Grout tectonics

Brit tile; Duck tile; In fan tile; The Green Tile; Once in a tile; The Tile Duct; Tiler, Texas; Tippeecanoe and Tiler too!; If you don't cut it out tile kick your butt; In Tile we Trust; Tiley Minogue; Gomer Tile; Tile Lovett; Tile one on; Tile in there; The Tile River; The West Tile Virus; Standing in a single tile line; Tile we meet again; A Tile of Two Cities

(Written on the grout such that it can be read only when bent far over while sitting on the toilet) You are crapping at a 45 Degree angle