Epic Riff: "The Hardest Button to Button", "Seven Nation Army", "The Air Near My Fingers", "Blue Orchid", "Dead Leaves and the Dirty Ground", "Icky Thump"... Hell, it's actually harder to find a White Stripes song that doesn't have an epic riff.
Internet Backdraft: If you want to start an epic internet throwdown, just go onto a rock music forum and write a post either defending Meg as a good drummer or attacking her as a bad one.
The Woobie: Meg, especially when breaking into tears during the end of a moving piano piece at the end of their Under Great White Northern Lights documentary film