There is a highway overpass that connects the Červinkova tram stop with both the IBM office and the Brno University of Technology. I walk it, and so do probably at least a thousand other people, everyday.
Every summer, graduating students spray paint their name and new academic title on the bridge. I guess some feels it's sort of a tradition. While I still don't like tagging, for some reason this doesn't bother me.
The colors change each year, and sometimes the students get creative but usually it's just Ing. and their last name. My favourite was back in 2011 where they included chalk outlines.