I had a 'Smash Hits' christmas flexi-disc. It was black, and was 'allegedly' the Smash Hits Christmas Party, with loads of pop stars such as the Duranies, Spandaus, Adam Ant, and other, 'popping in', accompanied by some special effects of doors opening, general merriment, jingle bells, and howling winds. The disc was sponsored by Black Levis so was interspersed with adverts for said garments - basically three trainee Santas complaining to their boss that they couldn't wear black levis. Very funny, has been the basis of my humour for at least 25 years.
Cheers