It is a custom in that country to sprinkle water on each other

The traditional Thai New Year, Songkran ("Songkran" is the translation of Sanskrit), also known as the "Water Festival", the festival, people sprinkle each other with water. During the festival, people sprinkle water on each other and wish their elders a long and healthy life and friends and relatives a lucky New Year. Unmarried young men and women, the use of water to express their love for each other. Thai people on the first day of the New Year in the window sill, the door end of a pot of water, pray for the New Year as desired, the wind and rain.