Back in 2001 I worked for a healthcare technology company. The guy in the next cubicle had AT&T as his provider, complete with their then-signature ringtone that was as annoying as all get out. Especially when said co-worker would leave his cell phone on his desk, ringer turned up, and walk away for an hour or two while the cell phone went off every ten minutes. He was warned several times and told to turn the ringer off. One day, the thing went off seven or eight times within an hour and our director grabbed it, tossed it in the toilet, fished it out, dried it off, and put it back on his desk.
He silenced the ringer on the replacement.