Well, Lauri, two of my club members...Expert Skill Class fliers...have fallen victim to believing in color coding their lines. One lost his model, while the other realized what was wrong on takeoff and gave "down", got some altitude and reversed the handle, as I heard the story.
I never have taken off with the lines backwards. I take the handle off the lines and leave both clips (including the one longer oddball) on the handle, and either one on the leadouts. I wind the lines toward the model instead of dragging the handle across the pavement or through the weeds. The spooled lines and handle go into a gallon ziplock bag, and the spool says what model they go to. That goes in the top of my cheezy plastic toolbox.
ONE time I was hooking up the handle, pulled on one line and deemed that to be the "up" line...but I was looking at the flaps. When I got hooked up, I wiggled the handle and saw that the elevators were doing the wrong thing, so reversed them. That was as close as I've gotten in 60 years of flying both CL & FF.

Steve