One night at a bar, Billy Bob and Susie Q wrote up an agreement on a couple of napkins about a construction project whereby Billy Bob would build a room addition to Susie Q's house.Billy Bob said he would do this in exchange for Susie Q agreeing to marry him.It took two napkins because the agreement would not fit on a single napkin.On one of the napkins, it was stated that the addition would be built according to plans "that are drawn up on a yellow pad at Susie Q's house."Billy Bob signed one of the napkins, but Susie Q signed neither.The contract price was $30,000.A few days later Billy Bob saw the plans, which were more complex than he expected.He told Susie Q that he could not do the addition.

Discuss Billy Bob's claims that Susie Q did not sign the agreement, there is no sufficient writing, and that the parol evidence rule keeps the plans out of the agreement.