According to a story from The Poke website, when drummer Phil Collins was 19, he got a call to go out to George Harrison's house to play the congas for a track on his album All Things Must Pass. Collins was excited, but when the album came out, the song had no congas in it.
Twenty years later, Collins met Harrison at an event and reminded him of the session, asking him what happened to the conga track.
Harrison said he didn’t remember, but he still had the master tapes and promised to take a look. Three weeks later, Collins got a package from Harrison with the master tapes from the session. When he listened, though, he realized that the congas sounded terrible. He also heard Harrison tell producer Phil Spector, “Get rid of that lad with the congas; he’s absolute rubbish.”
Mortified, Collins called Harrison to apologize. After a few minutes, though, Harrison started to laugh. “Those tapes I sent you - they’re not the real sessions.”
He’d hired a band to re-record the song and played the congas himself, as badly as he could, then said the line about Collins being useless.
“I wish I could have seen your face” Harrison said. “I’ll send the real sessions to you; you sounded great.”