Strange sound when I accelerate

This might not be a problem per se, but I wanted to see if anyone knows what this could be. This only happens after I start my car for the first time each day. After I let the car sit for a couple of minutes to warm up (like 2-3 mins) I place the car in first gear (MT) and proceed to slowly accelerate forward out of my garage. What happens is I hear a sound that sounds like a metallic object shifting from one side to another coming from the front end of the car. Now this only happens ONE time a day and the sound is hardly noticeable, but being that this is my first new car I'm kind of anal when it comes to making sure everything is ok with the car. Anyone have any idea what this could be? And why would this happen only one time a day?