Ive memorized every item and hero. including things like how thing stack or work. Or Their base spell in the wc3 engine. Like how Lesh's diabolic edict is actually a summon spell in its base form. Summons crap that randomly hits things around him and follow him.
But I get old versions mixed up with current ones. The details. Like how long this stuns or how much exact damage this does.
Off the top of my head: I still couldn't tell you all the properties of the Brewmaster "Brewlings". Not sure on specifics of DK's ult. And the numbers in general I don't think anyone really knows 100%.