It bothers me... I have a clicking noise in the back, sounds like a coin hitting up against the back windshield. Comes and goes, but i hear it nearly every day (so slight, but i guess since the car is so quite and smooth; this abnormality stands out - but my friends think i am crazy). When i go over uneven ground with no radio the noise taunts me. I have only 2500 miles on the car and was going to bring it up to my service rep when i go in for my 5000 mile check up but i know there wont be much for them to do. i think it has something to do with cabin temperature as well, i know its nothing physical moving around (checked everywhere)...