A car ahead of us was moving erratically from one lane to another with no apparent reason. After some time we got closer, and I saw that the two young men in the car were drinking out of a beer bottle. They kept on driving wildly, moving from one end of the road to the other, and suddenly coming up right near us when we tried to pass them, so that we had a couple of narrow escapes. They even moved into a different road once, and then turned right around and followed us once we'd got a little way ahead. They seemed to be deliberately baiting us.
We lost them after a few kilometres. I hope a hard knock that hurts no one else - or the police - knock some sense into them if they try such stunts again.
And if any of you ever drink and drive - please don't. It's not fun. It's just idiotic.