I noticed a loud rattling noise coming from my front hub on the way to work today. It started getting louder, so I stopped and tried to diagnose the cause. I ended up loosening then re-tightening the quick release, and on moving again, found that the noise had completely disappeared!
This concerned me, because I had visions of the front wheel deciding to take a different route to me at some part of my ride. Normally, I'm good with securing the QRs, but I guess there's a first time for everything.