The "A Working Day" a capella project—having the audiences at seven different concerts sing specific parts to his song "A Working Day" and then assembling it into one gigantic concert. Seen here in all its awesomeness.
During a performance in England, an event he later dubbed "The Night I Made England My Bitch", a chatty crowd kept breaking his concentration when he performed a ballad. When he calmly told the crowd that he wouldn't play the song if they didn't stop talking, they did. All of them. For the entire song.