The entirety of Belgariad jumps to mind... Though Polgara didn't usually punish the whole team, only Garion. It really made me hate her character when she never told him anything and then got angry at him for doing something stupid. And even though she seemed to honestly believe that keeping him stupid and ignorant was the way to go, I got the vibe that she also totally enjoyed her mysteriousness. It became even more apparent in her own book, Polgara The Sorceress.