According to USA Network: "The pineapple was on the doormat at Shawn's apartment!"
However, you really can't see the doormat clearly enough to find the pineapple.
More discussion on this episode's pineapple appearance (including screen captures) can be found at: http://psychpineapple.com/2009/10/shawn-takes-a-shot-in-the-dark-episode-9/
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Shawn was never stabbed but he was shot in season four episode nine titled: Shawn Takes a Shot in the Dark.
Arithmancy. Hermione takes this class, but Harry does not so we never actually meet Professor Vector.
It takes time for your eyes to adjust when you go from bright to dark. The televison series "MythBusters" (Discovery Channel) did a test to determine why so many pirates had eye patches. When going from bright to dark (as in under a ship's deck) flipping up the eye patch and exposing the eye that's already used to darkness allows you to see in the dark more quickly.
Funny Bones
its dusk not dark