(Mentalfloss) - More than one secret lurks in the aisles of Trader Joe’s, the trendy, organic-loving grocery franchise that was spawned from a chain of convenience stores in the 1950s. Shoppers have tried to guess whether their store brand mac and cheese is actually made by a major food label going incognito. (Verdict: No one’s really sure, but the mac does taste a lot like Annie’s.) Managers are called “captains” instead of managers because founder Joe Coulombe really liked the oceanic motif.

But the biggest mystery of Trader Joe’s may be in their liquor section, where their store-endorsed line of Charles Shaw wine sells for as little as $1.99 a bottle in some markets.

How can wine cost as much or less than an equal quantity of bottled water? More than just getting slightly tipsy, will you go blind? Will it work in your car’s carburetor?