"Hallelujah I'm a Bum" played on homemade ukulele

Scott Matthews says:

It's a hand-made ukulele built from an old Deluxe Memory Man box (the Deluxe Memory Man is a classic analog delay, and one of EHX's best-known pedals).

The song seems to be a 100-year-old hobo folk tune, and I can't get it out of my head!