It's a core feature of many delusions--thoughts are either being beamed into the body, or the afflicted thought's are being "tapped" by some form of transmitter. It is not uncommon for aliens to be involved, or more commonly, the government (who we all know would never do such a thing w/o a warrant
). Heavy use of methamphetamines can provoke these types of delusions as well.
On another note, I just read this thread and was struck that no one mentioned (and it's often overlooked) the importance of aligning woofers with the Earth's magnetic field. A handheld compass is the only tool needed--first establish the polarity of the driver's magnetic field, and then simply rotate the sub until the woofers magnet and the earth's magnet are aligned. The impact on the sound is subtle, but can really help to dial things in. In the case of overbearing subs, rotating it so that the magnetic field of the driver is going against the grain can be of minor benefit. This phenomenon also correlates with atmospheric ionic current. Unfortunately we are in a null and so the impact may not be as noticeable. But if you listen critically taking careful notes every few months for the next several years, the pattern will become obvious.