There have been 1383 UK chart single number 1s since 1952.
Running just 2:35, the song is a duet between Frank Sinatra and his daughter Nancy. They sing the entire lyric together, so it doesn't seem like their singing it to each other (which would be awkward), but to someone else. In many off-balance relationships one party can ruin the moment by saying "I love you," forcing the other person to explain why they don't share these feelings. That's what happens in this song, where "I love you" is the somethin' stupid.
More songs from the same decade.