Watch the trailer for the 'Simpsons' marathon

Back in July, we told you about the upcoming massive Simpsons marathon that kicks off Aug. 21 on FXX. That's right -- all 552 episodes in the show's 25-year run, plus The Simpsons Movie, will air in an epic 278-hour binge of gently subversive animated satire.

That's nearly 12 days, so you'd better stock up on donuts. (

.)

However, before you run down to the Kwik-E-Mart, check out the trailer for this once-in-a-lifetime event:
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