The key to a successful installation is tautness. If it is not taut then it will not work very well.
Another important thing is height. If it is too high, it will not work. It might stop them, and they might say “Hey, what is this?” but it will not have the proper effect. If it is too low, they might miss it. So height is important that it be just right.
Next, invisibleness is important. If they see it, then they will stop before they get to it, and you will have lost the important effect of surprise.
Another important thing is where. If you put it at the bottom, then when it happens there will not be very much distance before they stop. It is important that there be lots of distance, so that gravity can do most of the work. Plus, if they are going the other way, then they might just bonk their nose or something, and then they would say “Hey, what is this?” like in the up above one.
Time of day is also critical factor. In the daytime there is lots of light, and that makes it harder for the invisibleness, which is a factor I already talked about. Plus, in the daytime there might be other people around who would hear it happen and might come to help. So nighttime is the best. In the night time, it can be like they were stumbling around like an idiot in the dark and so that is why it happened.
Plus, safety for others in and around the place is critical. You do not want any of your true friends to be adversely impacted. Make sure they are safe in bed and asleep so that they will not experience it themselves. Remember, you’re doing this FOR them, not TO them.
Last, let me talk to little bit about your stealth and tradecraft. If they see you, it might be a warning. So surprise is an important factor. But, if they see you just after it happens, that might be okay because then they will understand in those last final seconds that they should’ve been nice. Of course, gloves are an important utility to have with you because of fingerprints. I am lucky because I don’t have any on my fingers, but I still sometimes wear a nice black pair for effect. They match my ninja suit.
Proper cleanupis also critical. Afterwards, remove it and any scratch marks that it might have left on the banister. Always leave the workplace the way you found it.
Well, I hope that none of my True Friends ever have to use this strategy, but if you do, you can do so knowing that you have had guidance and clear instruction from one who knows. Plus, remember that my professional services can always be engaged, should you have need of them.