SAT Subject Test and College Admission - Does one benefit the other?

I am currently in the midst of deciding which SAT Subject test to take. Because I am fluent in French and have been studying in the French system all my life, it seems natural to me to take a French subject test. However, I’ve heard echoes saying that a French SAT subject test on my application will look foolish and stupid, giving the impression that I’m scrambling for extra points.
How is this perceived by the college admissions board?
Thanks!