Fionn Mac Cumhaill & the Salmon of Knowledge

On his travels across Ireland Fionn made his way to the river Boyne where a Druid and Poet named Finneigeas, he had lived by the river Boyne for seven years hoping to catch the "Salmon of knowledge". Finneigeas had learned of a prophesy which told of how vast wisdom would come to whoever caught and ate this fish, but the prophesy also stated that the person to catch this fish would be called "Finn" and finneigeas assumed it was himself. When Fionn arrived at the dwelling of the Druid he presented himself as "Demna" and asked Finneigeas to teach him the arts of poetry and magic.
One day as Finneigeas was walking along the bank of the river Boyne he saw the giant Salmon he had been chasing for seven years. He caught it and watched the colours of the rainbow shimmer on its skin, he carried it back to his house and asked his pupil (Fionn) to cook it on a spit over a cooking pit. Finneigeas also told Fionn not to taste the fish, but when Fionn was cooking the prized Salmon the skin started to blister and Fionn fearing the worst pressed against the bubble to push in back but burned his thumb and with sharp reflexes withdrew his thumb and shoved it straight into his mouth.
By now the smell of the cooked fish drifted into the house and when the fish was brought to Finneigeas he wanted to make sure that Fionn had not tasted the fish before him but when Fionn revealed all Finneigeas offered the rest of the Salmon to Fionn realising the prophesy had come true but not in the way he had thought it would.