What do you mean by throwing a cup, the first laughing cup, the second yin cup and the third holy grail?

Cup-throwing is a popular divination method among the people. Divination instruments are like horns and cones, which are divided in two from the middle. The cup of laughter, the cup of yin and the holy grail you mentioned are three kinds of hexagrams respectively. Let me explain it to you alone.

Laughing cup: hexagrams are two identical faces, namely laughing cup, which indicates uncertainty and needs to be divined again.

Yin cup: Yin cup is two halves with negative sides, indicating that things are not going well, so be careful. Or you can't do it, then give up.

Holy Grail: It means everything goes well (heads are heads, backs are tails). One positive and one negative is the harmony of yin and yang, which is natural and smooth).

As for your "one cup, two cups and three cups", I have never heard of it.