Trading Places - Drunk Santa
Aykroyd, who has had his cushy lifestyle forcibly interchanged with that of homeless man Eddie Murphy in order to settle some nature v. nurture related bet, returns to reclaim his job in a Santa disguise. He crashes a Christmas party, shoves a surprising amount of food and drink into the TARDIS-like interior of his suit, pulls a gun, gets peed on by a dog, consumes some bread partially tangled in his beard and attempts to overdose in the bath. Until Bad Santa, this was the highest concentration of 'Santa engaged in most un-Santa-like behaviour' ever captured on screen.

Sandwiches stolen from buffet: 8
Capacity of suit: 10/10
Christmas spirit: 0/10