I remember seeing him at the Jazz Showcase in the '70s. A notorious lp collector came with a huge stack of records for Joe to autograph. Joe was going through the stack and found a couple by the pianist Joe Turner and gave the dude "the eye".
I saw the same guy greet Mingus with a stack of about 50 lps and around half way through, Mingus looked up and said "So, you can't say I'm not a nice guy"! Laughs all around.