Through this Shiva shows his devotees are even greater than Him

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Sundarar

1. In his previous incarnation Sundarar was Alala Sundarar, who was an ardent devotee of Lord Siva. When the Milky Ocean was being churned by Devas and Asuras, a deadly poison began to spread on the surface of the ocean threatening the existence of all beings. Then Alala Sundarar collected that poison in his hand and gave it to Lord Siva Who drank it for the protection of the world. Hence, Sundarar got the word Alala (for Halahala, the poison) prefixed to his name.
2. Sundarar is unique among the Nayanars in that both of his parents are also recognized as Nayanars. 
3. Gave spade via adi parashakti to alavar http://universalfeet.blogspot.com/search/label/Kazheesirama

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