Strange sensation

I had a brief business trip to Boston on Wednesday and Thursday. My client has moved to the suburbs (they used to be in Cambridge) so the trip from the airport to the hotel was unfamiliar. At one point I looked up from my Blackberry and absolutely no other vehicles were visible in the tunnel we were in. I felt like I was in a sci-fi movie and the cab driver and I were the only people left in the world. It went on for what felt like 5 minutes but was probably only 30 seconds. Long enough for me to think about it and get completely freaked.