I don't, what's the joke here? I looked him up and see he's an artist but I don't see any direct jokes related to repeating or large knives.
David Byrne was lead singer for a band called the Talking Heads, and they had a song called Psycho Killer. One of lines in the song is “say something once, why say it again?”
It’s a pretty obscure reference and I did not get it when I made my initial response.