The Best Video Game Black Friday Deals

Your handy list to all the mega chains' best video game deals and bargains this Black Friday.

Source:
http://blogs.ocweekly.com/heardmentality/2010/11/the_best_video_game_black_frid.php

xkcd 3x9

Handy exam trick: when you know the answer but not the correct derivation, derive blindly forward from the givens and backward from the answer, and join the chains once the equations start looking similar.

Sometimes the graders don't notice the seam

Source:
http://xkcd.com/759