It's not that much of an OMG moment, but... back in 1986 the band I was in were rehearsing one Saturday afternoon at Angie's in Wokingham. We'd pretty much finished and were having a chat prior to packing up when a guy walked in at the back of the club. He was in shadows so I couldn't see his face. "Oh sorry", he said, "are you still playing? I can come back in a bit". We told him we were done and were about to pack up. He struck up a conversation, asked us what we were called etc., and being young and arrogant and convinced of our impending fame, we were a bit cheeky with some of our replies. He either didn't notice or wasn't bothered by it. After a few questions he says "Good stuff...", steps forward into the light to shake our hands, "my name's Herbie...". I mentally added the word 'Flowers' and my jaw did a clang. Turned out his jazz quartet were playing at Angie's that evening. After the greetings, he looked at us and reached into his pocket... "Well I dunno about you, but I'm skinning up...". Made one for us to pass round and one for himself, and my god it was good gear
Thank god he turned up too late to hear me playing