January 20, 1992 - Ice Cube Has a Good Day
(Note: While it could be argued that Ice Cube lyrics are neither nerdy nor fictional, I think the process by which this date was discovered is nerdy as hell. Check the Source link for more info.)
When rapper Ice Cube woke up on January 20, 1992, he thought the day seemed kind of odd. There was no smog, he got a call from a girl, and played basketball all morning. From there, he headed to his friend $hort Dog’s house, where he watched Yo! MTV Raps and came out ahead in some gambling. Nobody he knew got killed, his favorite basketball team won, and he had sex with a girl he’d been chasing since high school. He finished the day off by getting drunk, but didn’t throw up, and had a nice burger.
(Ice Cube - It Was a Good Day, 1993)