One of his pieces sold as a "mural with a house attached to it."

In 2007, a couple wanted to sell their home which had an old Banksy freehand graffiti piece on it, featuring senior citizens bowling with bombs. When they found out that prospective buyers wanted to paint over and remove the piece, the couple turned to Red Propeller art gallery, who sold the lot at Sotheby's auction house as a "mural with a house attached to it" for about $155,000.

fact via / image via (photographed by: Evil Tom Thai)