This sound is from Mr & Mrs Smith Soundboard

Mister, usually written in its contracted form Mr. or Mr, is a commonly used English honorific for men without a higher honorific, or professional title, or any of various designations of office. The modern plural form is Misters, although its usual formal abbreviation Messrs(.
See also: MR, Mr.Mr., Mr. A, .mr, Mr. Irrelevant, and Mr. Bean.