A song normal people sing as an exorcism to get the brainrot demons out of someone when they have no other choice.
It is said that the song makes a "brainrot overload" happen, where the brain consumes so much brainrot, it has no choice but to release every single bit of brainrot into the world, releasing the brainrot demons. However, those brainrot bits have a chance of landing into the brain of one of the people performing the exorcism, so, after the exorcism, the performers must stay at least 6 feet away from the brainrot demon victim for up to 100 days.
"We have no choice but to sing... The Fanum Tax Song."