Incidentally, McDonalds burgers are, literally, full of ****. There was an e-coli case a few years back in the US, which was attributed to the burgers being undercooked - the e-coli came from feacal matter which got mixed in with the meat at the slaughterhouse (cows get scared, presumably). The point being that the crap is always there, it's just normally cooked - killing the bacteria.
Incidentally, I once worked at a McDonalds (for 3 whole shifts before quitting - a record I've been told

) - and I struggle to see how anyone could be so monumentally stupid as to undercook a burger on a grill which is completely automated. In fact, the only difficulty I can remember was cleaning the grease (layers of it) off the top & bottom of the grill tray, which inevitably involved dripping, boiling grease, a plastic scraper and 3rd degree burns on my arms I tried to reach inside the bloody thing.......