I would materialize them safely on the ground. Just like I would transport nuclear submarines to their home ports before I confiscated the uranium in their reactors.
Let the record show that it was not the right-wingers whose thoughts immediately went to mind control and physical attacks.
That’s not a physical attack. It’s education. 
It seems calculated to intimidate voters of the opposing party. I thought liberals were supposed to be against that sort of thing.
Seriously, I’d love to work a miracle or three. But why would I want to convince the world that I can? I don’t need or want the related fame or infamy. That would be horrible, IMO.
I wouldn’t want everybody to know that I had such powers…but since that is what the OP wants, that is what the OP gets.
For the period of one day, I would put my face on every billboard in the world, stick my name and number in every cellphone, and give everyone around the world the ability to understand and speak Klingon fluently.
That is harmless. It is the nukes on board that is dangerous.
Not mind control, something wonderful will happen to them that they will want to retire.
I may have botched the OP a little. For those who have continued reading the thread, here’s the somewhat modified hypothetical.
First, the goal is to prove to humanity as a whole that a miracle has occurred. Trying to keep things secret is fighting the hypothetical.
Second, in order to try to keep with the spirit of the other thread and make this one a little more interesting, you only get to perform one miracle. I leave it to you all to decide for yourselves what constitutes one vs. multiple miracles.
The other restrictions about not using the power for evil remain in place.
In that case, I’ll stick with giving everyone the ability to speak and understand Klingon fluently. No one is compelled to speak it, it does no harm, and I can’t think of any way to replicate such a feat scientifically.
Heal the sick, raise the dead, stop natural disasters, create new technologies out of thin air that make the world a better place.
If people believe me, great. But even if they don’t its still worth it.
Who said I’m a liberal?
I just think the GOP has gone entirely off the rails in the past decade between the Tea Party and Trumpism, and something harmless but embarrassing like violent diarrhea would potentially be enough to tip the scales, if all GOP politicians had that affliction.
If you’re worried about dehydration or electrolytes or something, substitute “uncontrollable burping and violent loud farting” if you prefer. That never hurt anyone.
Missed this part.
For one day, Iet all humans who live and who have ever lived share a consciousness. Everyone can enter anyone elses consciousness, see their thoughts and feel their feelings. You can reach out to anyone to communicate to them or merge your consciousness. You can speak to dead people, enter the mind of people on the other side of the world, etc.
Being John Malkovich times 110 billion.
How would this not be classified as “evil”?
With the new stipulations, give everyone the power to create happiness in their lives.
I’m not sure if this one is against the not affecting people’s minds rule, but I wouldn’t make them happy, just give them the power to make themselves happy. In an instant and on command.
They might not know I created it, but they’d sure know that some kind of miracle took place.
I like this one.
Originally I was going to make everyone immortal, immune to pain, and sterile. But that might not count as just one miracle (and would sterility be considered hurting others?)
Soooo … other possibilties:
If I wanted to prove my miracle-working superpower, I would ask the person I was trying to prove it to to design the test.
I believe the test involves doing one thing to convince as many people as possible.
