A man and his fiance are walking down the road when his fiancee sees a diamond ring in the window of a jewelry shop.

She looks at him and he takes out a brick from his backpack, throws it through the window and gives her the ring.

They walk on and after a while she sees a designer dress in the window of a fashion boutique. She looks at him and he takes out a brick from his backpack, throws it through the window and gives her the dress.

They walk on and after a while she sees a Rolls Royce Phantom in the window of an exotic car dealership. She looks at him and he says:

"You know, bricks don't grow on trees"