A $50 million painting by Vincent van Gogh has gone missing from a museum in Cairo, and it's not the first time. Police in Egypt have put airports and seaports on alert for the artwork, which goes by Poppy Flowers or Vase With Flowers. It's not clear how thieves got it, but the AP notes that it was stolen once before in 1978. Authorities didn't get it back for two years, when it turned up in Kuwait. And, cue the intrigue music, Egyptian authorities never made clear what happened to those original thieves.