Fun fact about the backflash story we keep seeing, it's a mish-mash of two different events that happened a month apart. The first, which ended with Janis Joplin smashing a bottle over Jim's head, was dubbed Morrison's Lament (which you can actually find recordings of on YouTube thanks to Jimi), when Jim got on stage with Jimi Hendrix absolutely plastered while they were having a jam session. Janis hit him so he'd stop, a brawl broke out, and the rest is history.
The second occurred in Montreal, when Jim, plastered again, tried to repeat history. This led to the famous "I'm Jim Morrison/I'm Jimi Hendrix" interaction. Jim then dove for the mic (and Jimi's crotch) while repeatedly yelling that he wanted to suck his dick.
I think the saddest part of both anecdotes is that it makes you wonder what amazing mashups could've actually happened if Jim weren't such a raging alcoholic. Jim was a genuine piece of shit in life and his alcoholism made him unbearable to be around throughout his career.