TL;DR: The Who’s Keith Moon used to give Ringo Starr Christmas gifts and send Ringo a bill. Ringo said Moon dressed up as Father Christmas once to give gifts.

Keith Moon (April 30, 1964 – Sept. 7, 1978) Rock history was made April 30, 1964, when the Who were playing a gig at the Oldfield Hotel in Greenford, England.