The messenger who delivers Clark's Christmas "bonus" is wearing a jacket that reads "Speed Ball Messenger Service". "Speedball" is a street term for a drug cocktail of heroin and cocaine, the same mixture that killed John Belushi.
National Lampoon's Christmas Vacation
It's Christmas time and the Griswolds are preparing for a family seasonal celebration, but things never run smoothly for Clark, his wife Ellen and their two kids. Clark's continual bad luck is worsened by his obnoxious family guests, but he manages to keep going knowing that his Christmas bonus is due soon.
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