Ambulance driver

The Ambulance driver is the man who arrives at the restaurant just after Mark Warner is drugged by House at the beginning of the Season 1 episode Honeymoon. He was portrayed by actor Mark Hames.
House had obviously called the ambulance before he drugged Mark, believing that Mark would arrive on time and he would have plenty of time. As it was, Mark arrived just before the ambulance did and House had to goad him into drinking a toast from the tainted glass. He admitted out loud that had the ambulance driver arrived a minute or two earlier, Mark would have been on his guard for such a trick.