On a site there's a preview of the chat log for each "room" on the site which a visitor can see without entering the room. The list is continuously populated with new messages. Thing is though, the list is not scrollable. You can't take part of the full conversation from outside, for that you need to enter and be in the room. The problem now is that the area containing the chat preview does look very scrollable:
I know some basic things you could do. Like not letting any message bleed outside the upper border (removing it instead), or adding a descriptive text saying something along the lines of "Enter to see the full chat". But I'm curious to know if you know of any nice pattern to use here to convey that this is a snippet, and what you see is what you get until you enter the room.