The first time the Message-of-the-Day feature in 1999.io and LO2 snuck up on me, when I wasn't looking for it. Funny thing happened. My mind jumped immediately to the emoji for pile-of-poo.  :poop:

Obviously that's not good. Going to start thinking about other options. The bell is out. 

Update: I went with a star. Unlike the alternatives I considered it doesn't look jarring or puzzling. Doesn't mean a whole lot other than maybe "look here for something star like?" Whatever. There aren't a huge number of choices.