One of the festivals of Tamil Nadu is Thaipusam. It is celebrated on a full moon day in the month of Thai in the Tamil calendar. Thaipusam celebrates the birthday of Lord Subramaniam, the younger son of Lord Shiva. Those who have faith, they make and keep vows and pray to the Lord. The actual festival day is a penance and devotees carry two pots that are attached to a long stick, and these pots have rice, milk etc which the devotee carries to the temple and offers to the Lord.
During Thaipusam, some devotees also pierce their bodies with sharp objects and profess to feel no pain. There are also some devotees who walk on coals to reach the temple and while this is a sight that is hard to behold, it just shows their devotion.