A nyagger with a 67% call rate...

A nyagger with a 67% call rate was teaching a class on "flow", known superstition.

”Before the class begins, you must get on your knees and worship open hands and accept that tanyao nomi is the most highly-evolved Mahjong tactic the world has ever known, even greater than yakuhai nomi!”

At this moment, a stunningly beautiful, intelligent, Math PhD and Mahjong champion who had successfully avoided last place 1500 games in a row and understood the necessity of damaten and betaori and fully supported all push/pull decisions backed up by probability stood up and held a tile.

”How fast is a pinfu hand, nyagger?”

The arrogant professor smirked quite cattishly and smugly replied “it's not fast at all, you stupid hag.”

”Wrong. It’s been 5 turns since I've reached tenpai. If it was too slow and open hands, as you say, are better… then you shouldn't have dealt in right now. Ron. 12000.”

The professor was visibly shaken, and dropped her chalk and the only tile left in her open hand. She stormed out of the room crying those nyagger crocodile tears. The same tears nyaggers cry when they find themselves without a yaku after eagerly calling for a Ton triplet two hands into the South wind. She wished so much that she had more time to come back from an embarrassing 0 point last place, but she herself had rushed through the previous hands with 1k point wins.

The students applauded and all became Hag players that day and accepted Mentanpin as their lord and savior. A hedgehog named “Damaten” climbed down from the beauty's shoulder and perched atop the automatic table and shed a tear on the tiles. Riichi Book 1 was read several times, and Nodoka herself showed up to denounce the falsehood of occultist Mahjong practices.

The professor lost her tenure and was fired the next day. She died of the nyagger plague yakuless furiten hadaka tanki and was tossed into the shadow realm for all eternity.

Pinfu and Tanyao are the foundations of Mahjong.