What causes uncontrollable smiling?

Related questions

1. Why do humans smile?
2. What is a real smile called?
3. Does moving your face cause wrinkles?
4. What does smile mean Snapchat?
5. Can you fake a genuine smile?
6. When did Harvey Ball create the smiley face?
7. Why are smiles contagious?
8. How does Smiling change your brain?
9. What is smile depression?
10. Why is a smile contagious?

Tags

1. #condition
2. #exaggerated
3. #frequent
4. #primary
5. #laughter
6. #tears
7. #involves
8. #state
9. #affect
10. #uncontrollable
11. #turns
12. #connected
13. #mistaken
14. #frequently
15. #emotional
16. #because
17. #depression
18. #crying
19. #often
20. #pseudobulbar
21. #laughing
22. #involuntary
23. #outbursts