Wierd Sound

[Will 16v Clio]

Just wondering what people think ive got a wierd noise when i drive with my window down sounds like a tapping/ ratling coming from the rear. Just wondering if think its the wheel bearing or something else?

 

[BenR]

Its very weird, but sometimes wind catches either the window seal or the seatbelt strap and something flaps. Its hard to watch whilst driving, but put your hand along the B pillar and it should stop.