Wile E. Coyote (hereinafter referred to as Mr. Coyote) owns a joke shop and he sold various products from Removable Holes In The Wall to TNT. He sold disappearing/reappearing ink to Roger Rabbit (hereinafter referred to as Mr. Rabbit) for $100. The label clearly said that the ink would disappear immediately but would reappear after 5 minutes. At the time of the sale, Mr. Rabbit told Mr. Coyote that Mr. Rabbit was going to use the ink to sign a contract with Disney Studios for $7500. Mr. Rabbit was excited to see the faces of the serious and stodgy Disney executives when the ink disappeared and then reappeared. Mr. Coyote assured Mr. Rabbit that the ink would reappear in 5 minutes. Mr. Rabbit was lucky enough to marry Jessica Rabbit, but that is another story.

Anyways, Mr. Rabbit used the ink when he made a movie deal with Disney Studios for $7,500 to say one word in a movie, which was "Plase." The contract was signed in the ink purchased from Mr. Coyote. Mr. Rabbit thought it would be funny that his signature disappeared for five minutes but then would reappear. The problem is that Mr. Rabbit's signature disappeared but never reappeared. After the contract was signed, The Disney Studio people and Mr. Rabbit went to lunch. The signature disappeared and Mr. Rabbit was laughing when this happened. After the two hour lunch, the signature never appeared. The Disney Studio executives did not see the humor in this and hired another person for half the price to do the work. Mr. Rabbit immediately writes to Mr. Coyote to pay him back but the letter was ignored. Mr. Rabbit comes to you to help him file a small claims action against Mr. Coyote.

Required:
a. Why does the defendant owe the plaintiff money?
b. When did this happen?