“A Russian tourist sparked a security alert when she threw a mug at the Mona Lisa, the world’s best-known painting, officials at Louvre Museum in Paris have revealed. Screams erupted from the 40-odd tourists jostling for position around Leonardo da Vinci’s enigmatic painted lady when the empty terracotta mug flew over their heads and smashed into the portrait,” which was unharmed behind its bullet-proof screen.