The bicycle bell. What a great invention....helps to warn others pedestrians and other cyclists of your position to ward off potential collisions. Often times people pleasantly thank me for ringing my bell. This is all great, except when that dreaded day comes AND the bell malfunctions. I was on the road, tried to ring my two tone bell and ....nothing happened. :( The ringer was stuck. I had to resort to yelling at the top of my lungs which isn't always pleasant.
Thankfully the good boys at Curbside Cycle got me back in the 'ring' of things with a new bell. :)