What a joke

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Across
  1. 7. Almost Groot
  2. 8. Excessively apologising, but with an A
  3. 9. Body Armour
  4. 10. It's goin' down, I'm yellin'
  5. 11. Starring Bruce Willis and Samuel L. Jackson
  6. 14. The best Microsoft program
  7. 17. Clothing and Walls
  8. 18. Your mother's mother, named Ite
  9. 19. Keeps ships watertight
Down
  1. 1. Con - Greek Island
  2. 2. Artillery
  3. 3. Wet partition
  4. 4. The first was bakelite
  5. 5. Zoolander's signature move, without the colour
  6. 6. Bad night of shooting
  7. 12. Broken down glass
  8. 13. Old time kid's game
  9. 15. The most recycled in the United States
  10. 16. NBN Windows