Thankful that no one else was around to hear your dirty joke that you should have kept to yourself, you chuckle, clearly not expecting the so-called "wish machine" to actually do anything. Its obviously some cute novelty gimmick to collect money for charity or something. Which is why your startled when you feel a sudden surging throb in your pants. Your especially surprised when it's not in the front of your pants, but in the back. It's like something's swelling near your butt! Ouch, your pants are really tight now...
RIP!!
Something tumbles out, but you can still feel it dangling as if it's somehow attached to you. By the time you muster a reflexive glance back there to see what happened, the surging feeling has stopped, but you see there IS something sticking out of your pants.
It's a long black tail, hanging down almost to your ankles, with a long black tassel at the end. Wondering what kind of gimmick THIS is, you're about to try to pull the fake tail off, but before you even reach down to grab it, you realize that doesn't make any more sense than pulling off an arm or a leg. It doesn't feel like a fake tail at all. It feels just like a body part that has been numb but now ... isn't. You try it out, watching it move in whatever direction you choose.
Then you feel a surge in your ears. Things start to sound louder, and more distinct. You reach up and feel them and shock yourself again when you feel the fur. These ears are huge! flexible, too. You tug them forward and backward, then you let go and realize you can move them without your hands just like you can move your tail. You can even more your ears and tail at the same time; it's as effortless as wiggling your fingers.
It's barely been a minute, you're standing there testing your new additions, when you notice: it's not over. The swelling feeling overtakes your whole body, you feel like you're ballooning out, the rest of your clothes start ripping, and before you know it, you're looking down at the machine from a much higher vantage point. When it stops, you feel stronger, heavier. You feel like you a weigh almost a ton and could probably give your previous self a piggy back.
"What on earth is going on here?" you ask yourself in a much deeper voice. Then, in a moment of clarity, it makes sense. When you asked the machine for the equipment and size of a cow it didn't know you were talking about your penis. You're actually the size of a cow now. In its own logical, mechanical, overly literal way, it even tried to reason out what the equipment of a cow was. Equipment is basically the tools people use, but cows are not tool using creatures, they just use their appendages. You probably wouldn't wish for something you already have, so it gave you three movable appendages cows have that you didn't. You are now a cattle-sized man with animal ears and tail. What now?