This sound is from Foley Miscellaneous Sounds

MOS is a standard filmmaking jargon abbreviation used in production reports to indicate an associated film segment has no synchronous audio track. In post-production, a MOS take may be combined with miscellaneous sounds recorded on location, the musical soundtrack, voice-overs, or sound effects created by a foley artist.
See also: List of One Life to Live characters, Oral tradition, Molof language, John Foley (bushranger), Richard Bradford (actor), Patrick Wilson (American actor).