Mark 6:49-50

‘But they, when they saw him walking on the sea, supposed that it was a ghost and cried out, for they all saw him and were distressed.'

They had spent hours at the oars and were exhausted, the wind was howling, the waves beating against the boat, and it was night, and the sight of this figure walking across the sea was the last straw. What could it be but a ghost? All of them saw it, and there was pandemonium as they shouted and pointed, or cowered back, in dismay.