Very common. It's the plastic cowling, where the windshield wipers are, knocking against the windshield. Mine did it driving off the lot. Dealer said "it's normal". I put double-sided tape that's padded between the plastic and the glass and it doesn't do it anymore. You can buy the double-sided, padded tape at Home Depot. That will most likely be the only thing that you have to complain about so consider yourself lucky. I had two Hondas that had way bigger problems than that in their first few thousand miles. Ironically, my new Ford hasn't had a single problem to mention in 12,000 miles. Seriously though, just tell the dealer to fix it or fix it yourself and forget about it.