Well, rehearsal actually doesn't guarantee success. That's just a basic fact of communication in general. :) Of course, the likelihood that a stutterer manages to get their words out in the desired fashion is noteably lower than with non-stutterers. But then again, we don't need to worry about 'perfection' if we *expect* a few hickups along the way.   --- Also, please stop sharing primitive memes in here. Misleading stuff like the above doesn't contribute much of anything.