I really enjoyed George's Marvelous Medicine. Having had a truly wicked crazy grandmother, myself, I related to George's plight and probably enjoyed his experiment with the craven old lady just a little too much! How fun!
I'm inspired to write a verse in response:
Roald Dahl's got it all
There's humor, suspense, and disgust
I'll have to try them all now
So my reading life's "Roald Dahl or bust!"