On the 2nd floor of Wean Hall at CMU somebody has sprayed a small patch of hydrophobic coating on one of the urinals (I think it's the 2nd floor, but definitely it's floor 2, 4, or 5). The stream normally turns into a "sheet" falling down the back of the porcelain, except around the patch -- where it hops off and turns into a thousand little droplets that bounce merrily down to the drain. Unless the person who put it there keeps re-applying it, the coating has had an impressive lifespan (at least 1 year in a semi-public toilet). Anyway, if you happen to be in the area (and male) you can try it yourself.