A valuable artwork was shattered when a tourist accidentally lost their balance and plonked their full weight down on top of it - and the museum that displays the Van Gogh chair called it a 'nightmare ...

which Sir Joshua Reynolds had declared the highest form of art. The Nightmare was an eruption from the subconscious that Fuseli was said to have accessed by eating raw pork before he went to bed.

His most celebrated painting, “The Nightmare,” which was exhibited to considerable excitement at the Royal Academy’s gallery in 1782, shows an unconscious woman draped across a couch with ...