They got mad because Maxwell's Silver Hammer took three days to record. Big Deal. - PaulDay three, and the Beatles were still doing that ONE SONG Paul McSassy was so persistent on doing. "Look Paul we've been at this stupid song for three days now. What makes you think that a happy song about a serial killer would top the charts?" Snapped John.
"I just want one of MY songs to finally be on the album alright? Now let's try it again because you guys were off on the last few notes."
John mentally screamed once he heard that last sentence. He couldn't stand doing Maxwell's Silver Hammer since he felt that ONE SONG took more time to record than the whole album itself. Not to mention that he was getting incredibly bored of playing the same notes and riffs over and over again. He wasn't alone either, George was extremely irritated that Paul was completely unsatisfied with whatever he did and Ringo actually got scared of the song after hearing it so many times. But the rhythm guitarist wasn't just going to sit there and let Paul just push them around for the upteenth time, so in the middle of recording John did the most unexpected thing.
"Wr-AAAAAAAAAHHHHHH!!!!!! JOHN!!!!!" Paul shouted in shock. John had his pants and boxers down and had flashed his bare butt in Paul's direction. "DEAR GOD PULL YOUR PANTS BACK UP!!!!!"
"No! You put the three of us through hell, or are you just jealous that I have a better bum then you?"
George and Ringo were now on the floor and laughing so hard their sides ached. But Paul face was as red as a tomato due to how hard he was blushing. Thinking that Paul had suffered enough, John pull his pants back up and left the recording room.
Yes, John actually did moon Paul during Maxwell's Silver Hammer, That's why you could hear him giggling