Welcome to the Replay Couch, where we kick back and watch the best, and worst, of recorded video game history. Each week we'll be offering up a compilation of captures from the world of insane speed-runs, chance kills, competitive moments, and hilarious happenings from the past and present.

This week sees the release of Portal, and, more importantly, the release of blurry-eyed speed-runners upon the game's timed puzzles. Look on for an idea of what you're up against, and keep scrolling for a few clips from Team Fortress 2, Halo 3, Skate, StarCraft, and the always entertaining Garry's Mod.

Impossible Video of the Week: Portal
Like ice cream, Portal hurts my brain. I can only take so many mind-bending maneuvers before my circuits begin to freeze up. This four second domination of Challenge 14 by chezda is a triple scoop of pain.

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Now You're Thinking Outside the Box Crate
This Portal player takes another pathway towards cake: cheating. Okay, not cheating--"creative thinking." Sineltor shows us how to stop worrying about our weighted companion cubes and love the PC, completing Advanced Challenge 18 in an unconventional run of 78 seconds.

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So Much Blood
Is there anything better in online gaming than an unbridled, uncaring charge into the face of your enemies? Couple that feeling with the gleefully sadistic taunts of Team Fortress 2's Heavy Weapons Guy and you get a clip that is both heroic and hilarious, all courtesy of grodno.

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Magic Bullet Theory
Is it luck, skill, or fate? You've seen Halo 3 videos of impossibly-landed sticky bombs and suicidal sniper shots, but here's one that would make Zapruder jealous. Catching an angled ricochet, spotteddogchez takes out two players with one shot, wounding a third for an easy follow-up kill.

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Turn the page for Skate Exorcisms, StarCraft-announcing Koreans, and a little Fitty.