Things that go bump in the night (or day)
  1. The screaming train horn
  2. A very small scurrying of tiny feet
  3. "We've met before"
  4. Drips, bathroom
  5. The hollow echo of something landing on the fire escape
  6. The house "settling"
  7. The dog barking in the dead of night
  8. "We should talk"
  9. Cats fighting, growling, screaming
    Suggested by @jhope71
  10. A car backfiring
    Suggested by @KaraLane
  11. A toaster POP
    Suggested by @chriscady