I'm Surprised There's Only Been Five

Quite a list:

One night, for a prank, Spector fired the gun in the control room, inches from the former Beatle’s ear. An enraged Lennon yelled, “Phil, if you’re going to kill me, kill me. But don’t f**k with my ears. I need ‘em.” Another time, Spector pulled his gun and chased Lennon through the hallways of the studio, screaming threats. Lennon later said of Spector, “I’m fond of his work a lot. His personality I’m not crazy about.”

And it of course leaves out the (presumably) one person he's actually killed.