Hugely popular with L.A. hipsters because of its longevity, location, often-overlooked cuisine, and elegant ambience "The Den" has been pushed into the mainstream of L.A. nightlife thanks to its inclusion in the movie Swingers. But it's the timeless lounge act of Marty and Elayne (the couple has been performing there up to 5 nights a week since 1982) has proven that fad or no fad, this place is always cool. Sidle up to the bar, where blue glasses are seen before patrons as they sip the house classic, Blood and Sand, a space-age margarita of sorts.