From [1] AP, with thanks to Treehugger:

CAIRO, Egypt - An Egyptian stabbed a Hungarian man and woman, slightly wounding them, after the couple kissed while pausing for a photograph near a mosque at Cairo's popular tourist bazaar, police said Tuesday.

Hesham Mohammed, 36, apparently was upset by the kiss Monday in front of Al-Hussein Mosque, a security official said on customary condition of anonymity. The mosque is adjacent to the Khan el-Khalili market where foreign tourists flock to buy souvenirs and locally made crafts.

The Hungarians, who were not identified, were treated at a nearby hospital for minor wounds, the official said, and Mohammed was being questioned. He was described as unemployed and suffering from severe
depression....

Well, I know when I get depressed, my first impulse isn't necessarily to stab somebody...