But before you get there, I attempt to communicate with the alien. They have superior senses to that of humans, and he/she/it/whatever notices me. I tell it that the orb is a fake.

It doesn't seem to care. I say that I was sent to say the deal is off.

Nothing.
It seems irritated (probably because I keep trying to tell it stuff even though it doesn't know me). It walks off somewhere, probably to get away from me. This is a huge alien black market; good luck finding him again.

Granted, you get every wish in a random order. You get invisible ice cream. There's gum on the roof of your house. The last wish granted is that "all wishes before this one made by me would have never happened".

I wish I could go to sleep.

@SingingSurger: I assumed that my new objective as the orb was to stay out of anyone's possession for as long as i can, but am i really supposed to do that?

Well, I think you should try to hide and all, but not make it way, way to hard for anybody to think of a way to get you again. I hadn't posted here for a while because I really couldn't think of anything to do next...

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I posses you to throw the orb out and into (YES) a CHROME CHEEZ!!!!!

...What?

Granted, but since human brains aren't designed/didn't evolve to be able to hold this much knowledge, it short-circuits and you die. Knowledge is power! Not in this case, it isn't.

I wish for several packs of Hellacious Blue Phlegm Aneurysm Gushers.

Granted, but the website's admins notice that you all gained infinite resources pretty much overnight, and ban all of your accounts. CC, Firecat, and TDO subsequently get extremely mad at you and engage in plotting some sort of cruel unusual punishment for you.

I wish sandals weren't so painful to wear, what with the strap digging in between my toes and all.

Out comes a very convincing videotape of you beating up a baby dragon on their property, which you quickly realize is fake because you would never dare hurt a baby dragon! Or at least, you never have done that. Looks like they're not playing by the rules!

I put in a screwdriver.

Out comes ice cream!

I put in an unused envelope.