CorridorDigital is so lucky. The freeway underpass which serves as ground zero for this group of cinematic YouTube aficionados offers the perfect mixture of size and symmetry for an effects-laden Team Fortress 2 romp. The nearest freeway underpass from where I live, on the other hand, houses a smelly cat, a large thornbush, and a vagrant who hides in large thornbushes. 

Check out CorridorDigital's excellent "Sentry Sabotage!" below, and make sure to leave a comment if you think Australian accents are really hard to pull off.