In his Life of St Anselm, Eadmer tells of a time when they were staying in a church in Italy, outside of which was a cistern with a hole in the top:
One night, when we were sleeping in this church, Anselm happened to get up with a gentle step, as his manner was, lest he should disturb us. But when he had got outside, he forgot the hole, and, making his way towards it in the darkness, he fell in, crying with a loud voice as he fell, ‘Holy Mary.’ At this noise, we and our companions who were sleeping in the tents, leaped up from our beds in a panic and ran to him. When we saw him at the bottom, we were almost beside ourselves with fear and anguish of spirit. Seeing this, he at once raised his head and with a courteous air and cheerful look told us that he had come to no harm. Some of us therefore climbed down on the side opposite to the sheer drop where there was a way of descent, and brought him out of the place altogether safe and sound. -Book 1.32, Trans. R. W. Southern p. 110
It’s the cry, ‘Sancta Maria!’ that gets me.