Call us intrepid reporters: we waited in line for 40 minutes today for a first taste of Fuku, the spicy fried chicken joint David Chang just opened in the former Momofuku Ko space at 163 First Avenue, near East 10th Street. The budding chain specializes in one thing: a crunchy, tender, magical chicken sandwich that comes on a steamed potato-bread bun with a fermented-chickpea butter spread, pickles and accompanying hot sauce. The room is a tight squeeze (hence the line twisting out the doorway and around the block this afternoon). But we managed to speak to some customers (all intense David Chang fans). Click through the slideshow to see what they had to say before and after (sometimes during) their first bites. Fuku is open Wednesday through Sunday, from 11am to 4pm.