Ollie's Birthday Surprise

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Across
  1. 2. The season after spring (6)
  2. 3. Olympic water sport (6)
  3. 8. If someone farts, they break ____ (4)
  4. 10. You put it on your chips. ____ & vinegar (4)
  5. 11. An outfit you'd wear to a wedding (4)
  6. 13. Another name for a pair (3)
  7. 14. Birds, planes and clouds can be found here (3)
  8. 15. 20-10-5-3-2= ____ (4)
Down
  1. 1. The colour of the hulk (5)
  2. 4. There was no room for Mary & Joseph here (3)
  3. 5. The force that keeps us grounded (7)
  4. 6. Wears a pointy hat and travels by broomstick (5)
  5. 7. How kangaroos get around (4)
  6. 9. You open me to enter a room (4)
  7. 12. Vehicles drive through me (6)
  8. 13. The nickname of the third chipmunk from Alvin and the Chipmunks (4)