What does it mean to have the Holy Grail and the Laughing Cup in the petition?

My mother always asks about the weather when she meets something she doesn't know how to solve.

Just shake two boards or something and throw them on the ground.

According to the front and back of the board.

The Holy Grail means that God agrees or thinks it can be realized.

Laughing at a glass is noncommittal, and it may succeed or fail.