Drunk driving is a major crime, with a number of countries having tough laws dealing with the same. A person convicted of the same can be fined, driving license revoked, and jailed (and all of these can also be applied at the same time for somebody convicted of the same). When a person is drunk, their ability to follow a rational course of action gets impaired, and in extreme cases, they can take any action. A drunk person starts doing something that the person would otherwise only think about, as can be seen in this example.
It is not normal for a normal person to start driving a train unless they have been trained in driving the train, especially when there are passengers on board. So what would you say to a person who gets drunk and tries to make off with a train loaded with passengers (link to article):
A middle-aged man, apparently under the influence, jumped into the engine of a passenger train and tried to commandeer it. Luckily, the man could not locate the accelerator and his journey lasted only about 50 metres before the train's two drivers and a posse of Government Railway Police (GRP) men managed to get inside the driver's cabin and halt the train.