Tracy drinks beer at a bar, then goes to a car dealer and orders a new car. tracy later claims he was drunk and should not have to buy the car. this:

The issue here is whether Tracy had enough to drink that would cause him to be mentally incapacitated. If Tracy was mentally incapacitated, the contract would be rendered unenforceable and thus, Tracy would not need to honor the contract and vice versa. However, if Tracy cannot show this, the contract will likely be upheld.