Fighting the revolution in Iran with squirt guns.

Innocent fun or serious political threat?

After heeding a call on Facebook, a group of nearly 800 young men and women were among those who showed up at the park....

They chased strangers around a giant water fountain, screaming and laughing as they splashed each other with water from toy guns, bottles and plastic bags.

"We had a blast. It was a rare chance for boys and girls to hang out in a public place and have fun," said Shaghayegh...

Facebook... flash mobs... is it just fun and games? Look at London. In Iran, perhaps the regime is threatened by something that is only fun and games. But now that the authorities have cracked down, it's become political... and politicizing to the young people — the under-30s — who make up 35% of the population.

Farzan, a 22-year-old university student who was one of the organizers of the Tehran water war, says police tracked him down through Facebook and raided his house in the middle of the night. He was arrested, held for three days and beaten up, he says.

Young Iranians say although the event started out as innocent fun, it has now turned political. They are vowing to challenge them with more events.

A nationwide water war is scheduled for Friday, after the end of the fasting month of Ramadan.

Didn't the American revolution begin with a snowball fight?