Raj went to the napa valley harvest festival, where he stopped at tina's booth where she was selling paintings of vineyards. raj admired a painting of vineyards, which did not appear to be for sale. raj said to tina, "i will give you $200 if you give me that painting right now." tina said nothing in response, but she gave raj the painting, and raj gave her $200 in cash. this is an example of a contract that is now