The Vegemite Effect - meta

There is a reason why sequels flop, McDonalds succeeds, blurbs are important, and Dawn Summers was hated by many fans when she first appeared.
That reason is known as The Vegemite Effect, and I am here to explain it to you.

( Hermione has bushy hair, bus tickets should be credit-card sized, Wolfram & Hart is evil, and Bruce Willis kicks arse.  )