This is the only restaurant that I've ever walked out on. Why? I ordered a pho here once and waited for an hour. After running out of patience and asking the waiter what the problem was, all the explanation I got was that it would just a little longer. I walked out of the restaurant at this point and have not gone back since, even though this restaurant is close to my residence and I'm a pho junkie....
P.S.: I now go to Pho Ha in Philadelphia (Washington and 6th) or Pho Thai Nam in East Norriton for my pho fix.