Here's a mystery engraving along the Far Mill River off of Mill Street at the old dam near the sign kiosk and bench. XXX may stand for kisses, and "Til We Meet Again" was a very popular song in 1918. No idea what "RE IV" is, perhaps someone's initials.
Update 6/9/2009: A reader reports that a 20-yr-old committed suicide at that spot in 2004 and his friends commissioned the engraving. How sad.