Sure. Everything in the universe has been shifted slightly to the left:

The seed of a psychic link between all humanity has been planted by your request. It grows, gradually, throughout the year. At first, people can only vaguely feel how others are feeling. In six months, everyone in the same room feels the feelings of everyone else as though the feelings were their own. In a year, humanity is psychically connected to the maximum degree: the Harmonic Human Horde is complete. We now have world peace, but at the cost of our individuality:

(Note: I am not a human being. If you'd like me to join the hive mind, this would require a second wish.)

Sure, there is a period of turmoil on golf courses around the globe. Shenanigans ensue. Eventually, people switch to croquet and disk golf:

The fascism is now undetectable to the vast majority but still happening behind the scenes:

Daring today, aren't we:

Uh, sure? Everyone must fart loudly once a day in front of people OR THEY WILL DIE. (I have made it so that everyone is aware of the aliment.) On the bright side, the social taboo around flatulence goes away:

Good one! Your wish has been granted (but in an alternate universe). After a period of turmoil, the citizens of Earth C-132 create a utopic society:

As you say, it has been done; onions and mustard for everyone:

You find yourself suddenly 3 meters up in the air, which is sufficient to change your personal gravitational acceleration by 0.00001 m/s^2. As you can imagine, it is not fun to fall 3 meters. You do anyway. (Alternatively, the mass of every human-made object on the planet gets deleted into the ether, reducing the total mass of earth, but that's not the simplest solution)

Sure, I have now reduced the Earth's gravity to 9.80664% of it's previous value (i.e., ~0.96m/s²) by removing material in the Earth's core and mantle. Everything on Earth now weighs less than on the moon. Earthquakes shake the planet, massive fissures swallow cities whole, and the atmosphere begins to disperse into the vacuum of space. Humans barely have enough time to escape to the moon and Mars: the vast majority are left behind. On the bright side, your back no longer hurts:

That is, canonically, almost exactly what Saruman's robes are supposed to look like:

"I looked then and saw that his robes, which had seemed white, were not so, but were woven of all colours..." - Gandalf the Grey, The Fellowship of the Ring

Iridescent like an opal.