Other mistake: Max says that Michael is the "Man of the house" and won't come in until he's invited, which Michael sarcastically does, except Michael isn't the man of the house - its actually his grandfather who owns it.
The Lost Boys (1987)
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Directed by: Joel Schumacher
Starring: Alex Winter, Barnard Hughes, Corey Feldman, Corey Haim, Diane Wiest, Dianne Wiest, Jason Patric, Kiefer Sutherland
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David: Drink some of this, Michael. Be one of us.
Trivia: Mary Lambert was originally set to direct, but was fired due to creative differences between her and producer Richard Donner.
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Answer: Because the Head vampire, Max, had fallen in love with Michael's mom. At the end of the movie he said, "Boys need a mother and if I could get Michael and Sam into the family, you would have no choice but to join us."