“Contagion” was pretty much a waste of our discount coupons and 6 gazillion dollars for popcorn, but (big-time spoiler alert) the ending could have been even more chilling. Bad enough a chef wipes his mitts on his apron and shakes hands with a patron. Imagine if that hand had been in a glove. Used in a bathroom shortly before it went into a pig’s snout. . . .