1) The Universe's equal and opposite reaction to Jack Black, in accordance with Newton's Laws of Motion.
2) New British slang meaning "to defecate".
1) Actual A Level Physics question from Specimen Paper:
"Name a particle-anti-particle pair?"
Accepted answers:
Positron and electron
Muon and anti-muon
Jack Black and Jack White
2) "Outta my way, I need a Jack White!"
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