Just been wondering, there's a particular distinctive speech manner (in terms of intonations) frequently heard in American game advertisements, comedy trailers and so forth, and it's often parodied.
It's a sort of dumb-sounding, lighthearted drawl.

Glee Trailer: http://www.youtube.com/watch?v=5V_7GyT3L5c

Here are a few parodies:
http://redlettermedia.com/half-in-the-bag/scream-4-and-no-brand-con/ 14:50
http://www.youtube.com/watch?v=p1MqksXm6Zs 6:05

South Park: http://www.youtube.com/watch?v=oFhkP2FQNDk

Does it have any name?