For many years there was a Mexican restaurant here in Austin called Pancho's Mexican Buffet. You'd go through the buffet line to start, then head to your table. If you wanted seconds, thirds, etc. you would just raise this little Mexican flag in the center of your table and they'd come and take care of ya'. People either loved it or hated it, but everyone LOVED the sopapias...! Slather 'em with butter and honey and you were in Heaven on earth!!!
There are still several locations here in Texas, but the closest one is down the road in San Antonio. Does anyone know if the San Angel Inn has them, maybe?