While tacking in a regatta, my eager but in-experienced crew had the habit of pulling the jib over and cleating to the new side, before we went throught the eye of the wind. Most people don't do this and it causes some wierd problems. The jib began to backwind and kill the tack. I didn't say much and decided not to fuss and just let the wind gently push us backwards and reverse my helm to get the bow around into the proper position. But, the boat didn't respond, we just stalled out, and we almost never got going again. This embarrasment happened one more time before I figured out we had executed a perfect Heave-To! So the next time I cautioned my new crew not to pull the jib over, and cleat it to the new side until we were sailing on the opposite tack. End of problem.