I had no idea that people weren't making their own popcorn until I read this post at Salt and Chocolate. To make caramel popcorn you just pop your own corn (see the link or the back of a packet of kernals) & then in a separate saucepan you mix a large chunk of butter with a generous helping of brown sugar and about a tablespoon of honey. Heat them all together, stirring as you go. Let it thicken for a few minutes. Take it off the heat & then mix in your popped corn. Serve. Eat. Brush your teeth :)
As you can see I'm a bit casual when it comes to precise measurements but reeeeeally you can't go too wrong!