This clever bit of graffiti was spotted in Ottawa, Ontario. It's patterned after Charlie Brown's iconic shirt and inverts Charlie's expression "Good grief" with the inscription "Grief ain't Good."
Link via Albotas
UPDATE: In the comments, Nick gives detailed information about this site. Thanks, Nick!
There's a great blog post about the house by the same guy interviewed in the Sun article here: http://centretown.blogspot.com/2009/06/yellow-house-redevelopment.html
The story behind it was that it was a pawn shop which closed in like 2000, was a crack den for awhile, and is now empty. It's supposed to be knocked down in the next two months, sadly.
More info: http://www.ottawasun.com/news/ottawa/2010/06/03/14251486.html