you got too excited at a rare drinking party and drank too much, getting completely drunk. It seems they passed out in the park, and when they woke up, it was the very early morning. On top of that, they have a headache from the alcohol... The party location was chosen to match a friend's convenience, so it was several stations away, making walking a pain. As they were worrying about what to do, a car stopped in front of the park!

you naively drank the water that was offered. Thinking back, they should have found it suspicious that the bottle was already opened without any signs of having been drunk from.

Overcome by drowsiness, you collapsed and fell asleep right there on the spot. The last thing they vaguely saw was the suspicious smile of the man who had offered them the water...