Some might say they've been doing corny pop for years now anyway, but deluxe editions of the Flaming Lips' new DVD will come with free boxes of homemade popcorn.

Christmas On Mars has been seven years in the making and to celebrate there'll be bonus CDs, T-shirts, trading cards, bumper stickers and the aforementioned popcorn with limited editions.

The lysergic opus debuted at film festivals this summer and features a soundtrack more reflective of the band's earlier, experimental output.

Coyne warned against blockbuster expectations for the flick, however, even going as far as to admit it could be a load of old "arty bull". Bet he's wishing he'd made more popcorn now.

"When you go see a movie that cost $100m to make, that movie should always be good," Coyne told the LA Times. "For $100m it should never suck, even if you don't agree with it ... But I knew going into this we didn't know what we were doing. We were just doing whatever came to our minds, and so this could really just be dumb, boring arty bull."

"I wouldn't play this to an 18-year-old who wants to rock," Coyne said. "I wouldn't say, 'You got to check this out! It's deep and moving!' I understand this is strange, abstract, moody weirdness. But we would have felt really frustrated if we couldn't just go in every tangent we got obsessed with. If we weren't able to pursue this, we'd be an old bitter rock group, or at least more bitter than we are now."

Elsewhere and Coyne also expressed worry that the band might get stuck "into one groove".

He said: "Even Radiohead, as much as I like their last three or four records ... there's a colouring and a shade that they sound like, and which they'll probably move through time sounding like ... We never really wanted to be like that. We just keep finding new things we want to explore."