Replying to Awkward bathroom announcements?

Do any of you do awkward bathroom announcements or is it just me. Say I am in a public bathroom dropping the brown, and someone walks in...I give a little sniff/cough to announce that I am in the room. I have heard other guys do it too. Just to kind of make my presence known, so that they don't do anything weird or walk in on me. Or especially if I am in a public bathroom where the lock is broken. Gotta be making noise so people don't walk in on you.

Am I the only one?