china 's ding junhui suffered a bizarre lapse of concentration which ended his chance of a rare maximum 147 break at the world snooker championship on tuesday .
ding jinhui was on for a maxumum break of 147 before screwing back for the blue instead of the black .
the world no 3 suddenly realised what he had done and held his head in his hands before starting to giggle .
he composed himself before attempting a very difficult cut on the black but was unable to keep the break going when his shot missed .