Warning: this video of a man scaling buildings and running from rooftop to rooftop in Cambridge, England is not for the faint of heart or stomach. The film was shot with a helmet cam, and gives a first person P.O.V. of what it would be like to run from building to building. Turns out, it's slightly nauseating. Thanks for doing it for us, Brave Anonymous Internet Man. We certainly wouldn't do it ourselves.