Check this one out. Alot of fish landed with a surprise at the end of the video. I have always wondered what would happen if you hooked a fish on the main line and the slider at the same time. Now I know....and another rod fires too. http://www.youtube.com/watch?v=dWNU8F9RmfY
We used to run deep diving cranks and spoons at the same time off of a three way set up, it was quite common to pick up double wally's on that set up. We've even had a double doubles B 4, it was fun landing them.