Shiva was born from the rage of Narayana!!!
When Brahma's night wore off, through the grace of that Being of immeasurable energy, a lotus made its appearance first, O thou of eyes like lotus petals. Within that lotus was born Brahma, springing from Aniruddha's grace. Towards the evening of Brahma's day, Aniruddha became filled with wrath, and as a consequence of this, there sprang from his forehead a son called Rudra vested with the power of destroying everything (when the hour for destruction comes). These two, viz., Brahma and Rudra, are the foremost of all the deities, having sprung respectively from the Propitiousness and the Wrath (of Aniruddha). Acting according to Aniruddha's direction, these two deities create and destroy. Although capable of granting boons unto all creatures, they are, however, in the matter of the concerns to which they attend (viz., Creation and Destruction), merely instruments in the hands of Aniruddha.
-Mahabharata, Santi Parva, Chapter 342
And again Krishna says
That Being whom, at the time of all thy battles, thou beheldest stalking in thy van, know, O son of Kunti, is no other than Rudra, that god of gods, otherwise called by the name of Kaparddin. He is otherwise known by the name of Kala, and should be known as one that has sprung from my wrath. Those foes whom thou hast slain were all, in the first instance, slain by him.
-Mahabharata, Santi Parva, Chapter 344
Obeisance to Nārāyaṇa, who is pure and eternal. Obeisance to the Lord of all past, present and future, who is in the form of Lord Śiva and auspicious Lord, the origin of Lord Śiva, and the most worshipable of Lord Śiva. Obeisance to Sri Hari, who assumes the most terrible form to end the Kalpa, who is of universal form, Lord of the universe and the supreme soul.
-Mahabharata, Anushasana Parva, Chapter 13
You are the creator. You are the destroyer. You support the worlds. You are Kāla, the destroyer of all. All the clans of Devas were created by you alone, O God. You are the path of all the worlds. You are salvation, the greatest goal. Brahmā, the eternal one of the Rajas form is the Lord born from you. Rudra originating from (your) Krodha (Anger) is also so (born from you). You are established in Sattva. O Lord, the mobile and immobile beings have been created by you for the sake of sport.
-Skanda Purana, Reva Kanda, Chapter 20
May the Lord of unlimited glory be favourably disposed to us—the Lord from Whose strength was born the great Indra, from Whose grace the (various) gods; from Whose wrath sprang up god Śiva, the Lord of mountains; from Whose intellect came forth god Brahmā; from the appertures in Whose bodies were created the Vedas and the sages, and from whose generative organ, the god Prajāpati.
-Srimad Bhagavata Purana, Skanda 8, Chapter 5
So Shiva was born from the wrath of Vishnu.
