Probably a reference to this[1] although the tweet is since deleted. Basically, some guy had heard/felt a sound like a bass guitar string snapping in his head and had some pretty serious symptoms afterwards, which he thought were physiological but many commenters leaned towards some psychological issue, since the OPs explanations were somewhat nonsensical.
v0x|4 years ago
[1] https://news.ycombinator.com/item?id=27003207
StavrosK|4 years ago