Possible Clues:

• Like 'Romeo and Juliet'
• It's not so funny for the American soldier in the cart that's overturned
• It's sad about the American in the overturned cart
• ...rejected, after a short time - that's sad
• Unfortunate accident's ending with rising smoke
• Greatly distressing
• Disastrous combination of temperature and smoke rising
• Like 'Aida'
• Extremely sad; Mahler's 6th nickname
• Sad, last trace of fragrant smoke coils around