LOL, yup you're not the first to mention it. It's just one of those quality control things (like the ship collision sound) that the devs let slip by and we are stuck with.
On the subject of quality control or "quality assurance" etc, I just finished Call of Duty 4 and was watching the credits scroll by while watching the cool background video and I noticed they (Electronic Arts) had over
60 people in their "Quality Assurance testers" section! Somehow I don't think SHIV used that many, if any LOL.