Why do I randomly laugh for no reason?

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Tags

1. #injury
2. #laughing
3. #laugh
4. #uncontrollable
5. #brain
6. #amused
7. #people
8. #happen
9. #condition
10. #happens
11. #having
12. #certain
13. #neurologic
14. #causes
15. #crying
16. #suddenly
17. #little
18. #spell
19. #conditions
20. #someone
21. #frequently