It turns out that the person who has picked up the lamp is a policeman coming to investigate what has happened with the presence of a huge chicken coop all of a sudden. How to explain that will demand a lot of paperwork and involved much of a headache. And picking up litter at the same time. The policeman mutters against his position in the hierarchy and how much he wishes to be a mounted policeman instead. While rubbing the lamp, your home, infinitesimally at the same time. You feel vexed at your home being termed a simple piece of trash so you decide to have fun with the man's words while formulating his wish. Time to have fun with what people wish for and you don't even have to show yourself. The lamp had been rubbed and the wish uttered. The rest is in your own genie hands now. A policeman is what hie is, for sure. It is the term "mounted" that can be fun to play with. Oh, of course, you know what the cop means. You are no idiot genie, after all. The cop wants to be a policeman on horseback. And you COULD grant his wish that way, be done with it, and not pretend you have misheard. But where would the fun be in that? And who's to know he is a good persona anyway? And you want to be mischievous. You'll try to be better for the next owner of the lamp, promise. You smile peevishly. Yes, "mounted" can mean a lot of things... You already know what to do.
The policeman thus only hears "Your wish is my command, master." before the world changes and his reality and life alters for good.