That night they gave him wine to drink, and the older daughter had intercourse with him. But he was so drunk that he didn't know it.
Come on, let's get our father drunk, so that we can sleep with him and have children by him.”
The next day the older daughter said to her sister, “I slept with him last night; now let's get him drunk again tonight, and you sleep with him. Then each of us will have a child by our father.”
Drinking too much makes you loud and foolish. It's stupid to get drunk.