It was business as usual for Jeff Tweedy this past weekend at the Hardly Strictly Bluegrass Festival, a free three-day event in San Francisco's Golden Gate Park. "I hope you're not in the mood for bluegrass," said Tweedy as he took the stage. "Because I don't have any."

During the solo acoustic set, Wilco's frontman -- never too shy to berate hecklers and no stranger to awkward stage moments -- unleashed his wit on an audience member who yelled, "I loves me some bluegrass!"

Tweedy brought the incident up repeatedly, stating that "it's not okay" to say "loves me some," and he asked the crowd not to use the phrase ever again. The attention to grammar came back to haunt him during his cover of Woody Guthrie's 'Airline to Heaven,' with its refrain, "Them's got ears, let them hear/Them's got eyes, let them see."

When Tweedy called himself out on it, the audience responded with playful jeers, giving him a taste of his own medicine. But he made it all too easy for the crowd to forgive and forget, especially when he extended his set past curfew to perform classics like 'Heavy Metal Drummer' and 'I'm the Man Who Loves You.'