Exclamation mark

I saw this on a let's play the other day, xurbansimsx I believe. She had it come up above a sim as well and when she checked the sim it said they were a litterbug. I think they throw trash out on the beach and your sim can stop them if they are a conservationist.

Edit: Just went back and checked to make sure and it was actually clare siobhan who found it. I've been watching too many let's plays for this pack. :D