Whacking sense into someone with a clue-by-four is easy when the recipient is young and impressionable - 20 years old or younger. Usually there's about three days of outrage immediately after the whack (less the younger they are), and then the light bulb comes on.
Getting light bulbs to come on when the recipient is 30+, on the other hand, apparently requires a month of intense aggravation, fallout hitting third-party bystanders, rifting of communities, and a lynch mob.
The same principles apply. The recipient has to be ready to listen at the time that the clue-by-four impacts. For young'ns it's just a matter of waiting for the right moment. For the old and set, getting them to that point can be really hard.
All in all, I think what I've most learned is that I'm much better at teaching than punishing. And next time, now that I've done it once and have a few new clues of my own, I can probably (hopefully) better contain the fallout and shorten the month.
And here's hoping the recipient does something useful with his new light bulbs.