Riiight. I do that all the time.
You wouldn't believe the college students out there who put their Social on fairly public documents (tests, papers, etc) as a matter of habit. In the last class my wife taught, nearly 3/4 of the students wrote their Social right under their name. I almost had a heart attack the first one I saw, and did convulse just a little bit when I found that almost all of them did it.