We just encountered this at a gas station over the weekend. We were traveling home from NJ after a month long trip. We pulled into a BP that had all pumps full, so I pulled behing a guy that was easiest for me. I noticed there was no one in the driver's seat and there was no gas being pumped (fuel door closed, etc). I looked at the lane next to us and there are two empty cars next to us, again no gas being pumped. The guy in front of me comes out and fortunately pulled away quickly. The drivers of the other two cars eventually came out. The never pumped gas and were in no hurry to move along.
I still amazes me how rude some people can be.
-Michael