This is the hilarious moment a Buddhist monk amused tourists by whacking them on the head with grass.

Monk Chalermchai Srimueang splashed sacred water on holidaymakers at Wat Suwannaram Ratchaworawihan in Bangkok, Thailand, on October 26.

Footage shows the spiritual practitioner strolling toward the foreigners sitting in chairs, dipping the grass stem into a large metal bowl filled with water. He then shakes the instrument to sprinkle the water onto them.

He can be seen repeatedly tapping other temple-goers on their heads with the grass, which drew laughter from onlookers.

The act of sprinkling water is seen as a way to purify the body and mind of those who receive it. Some see it as a blessing.

Water, in many cultures - including Buddhism - is considered a purifier, cleansing negative energy, sin, or impurities.

The sprinkling of water can also be viewed as a representation of the Buddha's compassion and kindness toward all beings.

Christians also perform baptisms by dipping people in water.