Water might be leaking by the flapper until the tank water level drops to a point where the ball-cock float finally has to open a bit to let in more water.
From the inrich.com
The refill valve may be an older-style ball cock with a stem and a floating ball, a modern tower valve with the float attached to a plastic tower or a tower with no moving visible parts.
From the ocregister.com
These devices are often associated with BDSM activities such as cock and ball torture.
From the en.wikipedia.org
Common injuries in cock and ball torture are abrasions, bruises, and cuts.
From the en.wikipedia.org
I agree that the images in cock-and-ball torture etc.
From the en.wikipedia.org
Mike would toss a baseball into the bucket, hear it rattle around, cock his bat, and wait for the ball to roll down a 2-by-4 ramp and flip off the lip.
From the stltoday.com
Another calling cock-up wastes a chance of a single and then Bopara slaps the ball to the cover boundary and takes one.
From the guardian.co.uk
A Festy cock is a Scottish dish made of a ball of finely ground meal, wetted and patted, rolled into a pancake shape, then roasted in the hot ashes from a millkiln.
From the en.wikipedia.org
Four paragraphs is at least a little more than one ball, which is all Stuart Broad got through before he made his first cock-up of the afternoon.