A week and a half of French Riviera frenzy comes down to, as it always does, wild conjecture. The 68th Cannes Film Festival concludes Sunday with the awarding of its top honor, the prestigious Palme d’Or, as well as a handful of other distinctions. Few trophies in movies are more sought after than the Palme d’Or, but, unlike the Academy Awards, which whittles its field down to a few favorites over the course of months, Cannes winners are chosen clandestinely by a jury. The mystery adds much suspense. Throughout the festival, the jury, led by Joel and Ethan Coen, has quietly slipped in and out of theaters. Their deliberations are private, but that doesn’t stop the world’s media from endlessly debating the possible winners.