Lyric discussion by lolguy23 

According to Lennon, the title came from the cover of a gun magazine that producer George Martin showed him: "I think he showed me a cover of a magazine that said 'Happiness Is a Warm Gun.' It was a gun magazine. I just thought it was a fantastic, insane thing to say. A warm gun means you just shot something."[1] The reference, whether or not intermediately from the magazine, was one of many 1960s riffs on Charles M. Schulz's culturally popular saying, Happiness is a Warm Puppy, which began in the Peanuts comic strip and became a widely sold book.

ironic at the thought of his death...

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