As an example of the running down of saliva from the mouth, it is stated that sometimes when Nārada Muni was chanting the Hare Kṛṣṇa mantra, he remained stunned for a while, and saliva oozed from his mouth. Laughing like a Madman
When a devotee laughs very loudly like a madman, it is done out of an extraordinary agitation of ecstatic love within the heart. Such mad laughing is an expression of the condition of the heart, which is technically called aṭṭa-hāsa. When a devotee becomes affected with this mental condition, his love is expressed through the lips. The laughing sounds, coming one after another, are compared to flowers falling from the creeper of devotion which grows within the heart of the devotee. In the Caitanya-caritāmṛta devotional service to the Lord is also compared to a creeper which rises up to the lotus feet of Kṛṣṇa in Goloka Vṛndāvana.
Wheeling of the Head
One gopī told her friend: "It appears that Lord Kṛṣṇa, the enemy of the demon Agha, has released from His mouth a whirlwind which is acting on your head and is gradually proceeding to do the same to the other lotus-eyed gopīs."
Belching
Sometimes belching also becomes a symptom of ecstatic love for Kṛṣṇa. There is evidence of this in Paurṇamāsī's address to one crying associate of Rādhārāṇī: "My dear daughter, don't be worried because Śrīmatī Rādhārāṇī is belching. I am about to offer a remedial measure for this symptom. Do not cry so loudly. This belching is not due to indigestion; it is a sign of ecstatic love for Kṛṣṇa. I shall arrange to cure this belching symptom immediately. Don't be worried." This statement of Paurṇamāsī is evidence that ecstatic love for Kṛṣṇa is sometimes manifested through belching.