I almost did once. The interview was at Ebay and the entire process was disastrous from the very first contact. Terrible management during the entire time. During my final interview with some manager, I was ready to just get up and walk out. My frustration was showing and undoubtedly contributed to me not getting an offer. The only thing that kept me from walking was my professional and the fact that they paid for my flight. The organization was so poor, I would not put it past them to cancel my flight if I walked out.