If you enjoy your popcorn with a kick, here are a few ways to do it:
Use some hot chili oil as part of the oil for popping your popcorn, or mix Creole seasoning into the oil.
Stir Tabasco or hot smoked Spanish paprika into melted butter and toss with popped corn. jbyoga likes a combo of curry powder, sriracha sauce, and salt. If you make microwave popcorn, toss it with garlic powder and cayenne, recommends MeowMixx.