In Phimai, rural area in Thailand, the temperature goes up to 40c.
In Japan usually temperature is much higher in city area because of less nature, but Thailand is the opposite.
Surprising thing is, they don't have air conditioner in each room.
In that way it is not surprising that they spread water on themselves.

Everybody aimed with water guns, not only young people, get onto trucks with barrels filled with water.
This kind of "barrel trucks" are prohibited in Bangkok, since it may cause traffic jam.
Somebody starts to play a music, everybody starts to dance.
Maybe whole country is dancing.

They use the water from the barrel and spread it around to "fight" with others .
I'm uploading the movie later!