Oh My G-- You have the dreaded click-- It can be lethal so watch out.

Cables catching on shoes- Crank extenders coming loose- Pedals having a Cranky bearing- Headset loose- Bars loose- BB Breaking up-Cranks loose- Wheel bearings going or the favourite being the saddle not tightened up enough.

Looks like you an investment to make if you don't have one already and that is a I-Pod with some loud music at the cadence you ride at.