#assuming the driver paul mentions is seaman the best support of his account is the video of john mentioning the song

[get-back-homeward]

…John hummed the melody of Paul’s new single, which he said he could not get out of his head. “It’s driving me crackers!”

Paul was the only musician who could scare him into writing great songs and vice versa.

From Fred Seaman’s Living On Borrowed Time (1991)

From Scotland Outside of New York [x]