So, on Sunday from 12 to 2 p.m. I will be standing in the backyard wearing a flyfishing vest and holding a fly rod, with a forced smile on my face, offering fly-casting instruction to anyone who stops by to see the house. My plan is to put out a couple of hula hoops to cast to. Also, there’s this deal where you lay out 30 feet of rope in a straight line. You stand on one side and have your rod tip touching the ground on the other. Then you start making single casts—forward and back—so that the fly line unrolls and lands on the far side of the rope. This is supposed to drive home the idea that the rod tip must travel along a straight line to make good casts, as opposed to moving the tip in a “paint the igloo” arc.