Axl Rose VS Slash's grandmother
Around the time Guns N' Roses first formed, before they'd recorded any demo tapes, and long before anyone had been pronounced dead (they came back, it's cool), or demanded a 4-million dollar Michael Bay-esque music video where they jump from an oil tanker to swim with dolphins... before any of that happened... Axl lived with Slash, in Slash's family home basement-room (full of snakes and cats) because, well, Axl was basically a good-looking homeless person back then.

Axl mostly slept all day in Slash's room, until Slash would return from work, wake him up, borrow his mom's car, and drive them to band practice and back.
One day, Axl decided to pass out on the living room couch, where Slash's dear old grandmother, Ola Sr., enjoyed watching her favourite TV shows. She politely asked Axl to go sleep in Slash's room so she could watch her programs, and he told her to "fuck off" (and enough other stuff to upset her).
Slash's mom told him (aka Saul) that Axl (aka William) needed to apologize to Ola, or it was Curb City (where the grass is not green, and the girls are not pretty) for poor Will Bailey, err, Axl Rose.

Slash tried to carefully run the idea of an apology past Axl during their drive to rehearsal that evening. Axl began rocking back and forth in the passenger seat, then suddenly bailed out of the moving car, going about 40 mph on Santa Monica Boulevard. He took a bit of a spill, but got up, and took off running.

Axl didn't show up again for 5 days, until he found a new place to be a bum at, and acted as if nothing had happened when he showed up to the recording studio (having missed 4 band practices entirely). He never mentioned the incident again.

GnR is a band that I've loved for the majority of my life. I actually love Axl more than any other Gunner (23 people have been members of this band). Their music is incredible, but they're a great band for stories, too. And, for some reason, I like that one best.