What is the first miracle?

When Miss Trunchbull blames Matilda for putting the newt in her glass, Matilda stares at the glass angrily. She wishes it would tip over onto Miss Trunchbull, who is seated at the desk, when she begins to feel a sort of electric build-up taking place behind her eyes. This electricy soon begins to feel like tiny invisible arms shooting from her eyes toward the glass on the desk. She quietly whispers for the glass to tip over, and soon enough, it does! The first miracle.