From Thaindian News:
In a unique ritual, a priest broke coconuts over the devotees” heads during a temple festival in a village in Dharmapuri District of Tamil Nadu, as part of their abeyance to the deity.(via Cynical-C Blog)
The ritual, which is unique to the festival of Veerapathiran Samy temple, is an annual ritual in which hundreds of devotees participated on Wednesday at Parvathanullur village
By breaking the coconuts over their heads, the devotees pay gratitude to the deity for fulfilling their wishes.
“The people of around seven-eight villages got together to celebrate this Veerapathiran Samy temple festival. Hundreds of the devotees come here and break coconuts on their heads for offering prayers to the deity. Devotees taking part in this ritual should maintain some devotional discipline then only the coconut will break, otherwise, they might suffer injuries,” said Muniyappan, the temple priest.