Winch launch failure practice, practice, practice.
In my early days at Shenington, we had, on the winch, a reliable 50% SUCCESS rate, using piano wire. Sometimes we even had 3 cable breaks in a row. Certainly kept us on our toes and current; I still remember an enthusiastic launch in a K8, cable broke under strain, spaghetti all over the winch; only thing for me to do was to stay airbourne for a couple of hours and so avoid the telling off for pulling too hard!
Our late CFI, Paul Gibbs, rejoiced in keeping us current; seldom indeed on a check ride with PG did Blogs ever get to the top. As an instructor, I developed a similar vein of sadism; after a briefing on the things we would do after the launch, eg. stalls, spins, going for THAT cloud, etc etc, the sneaky hand on the yellow knob, and boing! Let's see what you can do with THAT problem!
Even more refined, brief the pilot on launch failures, then don't give him one.