Is this for real?

The Cult of the Snuggie threatens to take over America! Or at least, a substantial number — 4 million — of late-night couch spuds.

The Snuggie, an oversized fleece blanket with sleeves, stars in a ubiquitous TV ad so cheesy it's practically art, and apparently wildly entertaining. The ad shows people wearing Snuggies at a sporting event, cheering and high-fiving each other while dressed … sort of like medieval monks. Indeed, Snuggies seem to be everywhere. See them on Facebook . Watch them on YouTube .

Jay Leno makes fun of them: "Lard-ass quilt was the original name! Why not just put your robe on backwards?" Ellen DeGeneres spoofed them, trying one on during her show. Fox News even spotted someone wearing a Snuggie in the crowd at President Obama's inauguration last week.

The Snuggie concept is not new, nor is it the only such product on the market, but the Snuggie proves once again that an attractive price (two for $19.95, plus free book light online and on TV, about $14.99 for one in stores) and clever marketing can take you far in American retailing.

Snuggies went on sale in August, began TV advertising in October and started shipping to retailers in December. Already, 4 million have been sold. But the Internet is crowded with angry testimonials from consumers who say they were overcharged or never got their order or waited much longer than four to six weeks for their Snuggies to arrive.

"I've gained 20 pounds since I started using my Snuggie," jokes Amy Norris of Baltimore, a member of a Snuggie fan club on Facebook. "I got it for a Christmas gift and initially thought it was just funny, but now we fight over it at my house."