Which of the following contracts would be valid? If they aren't valid, state why they aren't valid. HINT: Think about whether or not the contract has a legal AGREEMENT and/or CONSIDERATION.

1. Elise and her 18 year old son sign a contract where Elise promises to give her son a car of his choice if he doesn't drink until he is 21.

2. A contractor discovers a pipe in the way when he is building his client's house and it will cost him an additional $10,000 to move it. He then gets his client to sign a new contract to cover the additional $10,000.

3. Al sells an ugly painting at his garage sale to Brian for $5. Brian then tells him that he just bought a Van Gogh worth $60,000. Al wants to get out of the deal, can he?

4. Sue sees a telethon on the television and feels sorry for the people who need help. She calls in and pledges $100.

5. A company sends Wyatt a DVD in the mail and states that if he decides to keep the DVD he owes them $15.00. If he doesn't want the DVD, he needs to send the DVD back or he is deemed to have accepted it.