What does joker in the pack mean?

Related questions

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4. Why you should not crack your knuckles?
5. What are fingers called?
6. Can you get addicted to cracking your knuckles?
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8. What is the space between your knuckles called?
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Tags

1. #other
2. #group
3. #joker
4. #unpredictable
5. #different
6. #things
7. #phrase
8. #people
9. #something
10. #describe
11. #their
12. #someone