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Vector, the villain who stole the pyramids, steals Gru's primary weapon for his plan. Gru tries to get it back, but fails with numerous booby traps. What does he discover is Vector's weakness?
Answer: Girl Scout cookies
After numerous failed attempts to break into Vector's house, Gru watches as three orphan girls approach Vector's house. He hopes to see some action, but to his shock Vector invites the girls into his home because they are selling his favorite Girl Scout cookies. Gru gets an idea!