Besides that fact that chat's error page is ugly because it has no styling, it also steals borrows the error lolcat image from Stack Overflow.
Of course we hope that nobody ever sees that page, but I'm sure we agree that's not going to happen, so we could at least have our own image.
So, what picture should the chat error page have?
You can go to yourfavorite.stackexchange.com/error
for inspiration.