Is Cracking knuckles rude?

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Tags

1. #fluid
2. #lubricates
3. #gross
4. #cracking
5. #bubbles
6. #joints
7. #crack
8. #thing
9. #human
10. #watch
11. #synovial
12. #their
13. #collapse
14. #1970s
15. #knuckle
16. #beings
17. #thought
18. #experts