the bourne ultimatum

so me and my partner/forum member, are walking out of waterloo station towards the london eye, (via the eurostar exit) and we notice two policemen standing by the exit, so we carry on walking only to notcie a commotion further along the bridge by the tunnel section, it turns out that they are filming, only the 4 film crew we had seen the whole day throughout london, so as we get nearer a few of the crew, come racing our way aswell as some old guy holding a pipe, and behind him was a crew member holding a chair saying the bourne ultimatum, then i looked to my left and who was standing thier only hollywood star matt damon! i was well shocked, id litreally just walked threw the filming of what will be a box office hit! anyone else see this?