Everyone has at least one song that sets their teeth on edge. Most of the time, they're easy to avoid.
But what if you'd lost the power to change the TV channel, switch off the radio, or simply walk away?
What if someone played it non-stop for an hour. A day. A week. Even longer?
This is "music torture" - and while some of its practitioners say it shouldn't count as torture, there's little doubt it works.
On Christmas Day, 1989, Panamanian strongman General Manuel Noriega - who died this week - became the most famous victim.
The repressive military leader had holed himself up in the Vatican's embassy in Panama City, after President George Bush Senior invaded Panama.
Noriega was facing a US indictment for drug-trafficking, as well as claims he had rigged the 1989 election.
The embassy was surrounded by US troops, but he refused to give himself up.
The US army decided to use psychological warfare - by blasting a wall of sound non-stop outside. A fleet of Humvees mounted with loudspeakers rolled in, and rock music rolled out.
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