Birthday Present

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Across
  1. 6. Howard's mother
  2. 7. The university where the main characters work
  3. 9. Sheldon's catchphrase
  4. 11. Leonard's middle name
  5. 12. Penny's last name
  6. 14. Penny's ex-boyfriend and leader of her band
  7. 15. Sheldon's childhood hero
  8. 16. Sheldon's favorite number
Down
  1. 1. Sheldon's preferred Chinese takeout restaurant
  2. 2. Leonard's mother
  3. 3. Sheldon's arch-nemesis
  4. 4. Raj's sister who has a crush on Leonard
  5. 5. Howard's wife
  6. 8. Last name of the Batman who attended Sheldons birthday
  7. 10. Raj's selective mutism is overcome with this
  8. 13. The comic book store owner