Mix the sugar and vanilla bean in a bowl; set aside about 30 minutes.
Preheat a cotton-candy machine according to the manufacturer's instructions, at least 5 minutes. Turn off the cotton-candy machine, pour the sugar mixture into the center and turn on the machine. When it starts to spin cotton candy, hold a paper cone in the middle, perpendicular to the machine, and move it around the edges to accumulate the cotton candy on the cone. Sprinkle with the curry powder.
Recipe courtesy Cat Cora for Food Network Magazine