According to Going Out Guru's Matchbox wants your $1 bill this Friday

"D.C.'s beloved pizza-and-sliders joint Matchbox offers mouth-watering mini-burgers in groups of three, six or nine. In celebration of Friday's date -- 03/06/09 -- both Matchbox locations will offer a special of $1 per slider, sold in groups of three. Since the usual prices are $8 for three, $14 for six and $18 for nine, that's a pretty big discount. "It only happens once a century," says co-owner Drew Kim."