I think I would locate a colony of chem-trail believers, then fly in a grid pattern over their house, making it really obvious that Something Odd is going on. Then when they run inside to get their cameras, I’d use my super-breath to clear the sky. 
Again, that’s completely misguided. That’s what you’d do if you were doing your goddam job as a superhero. But this thread is about what you’d do when you’re off the clock and just trying to have a little fun.
Of course your Superdickery could turn out to improve society in subtle ways, like my special car alarm turn-off service. But the dickishness has to outweigh the good, otherwise you’re just a plain vanilla superhero.
I’d probably use my superspeed to substitute those little balls they pick lottery numbers with, so I start winning every lottery in America. Every time. And take the money and just put it in a big pile and grin like a loon. When everyone realizes that NO ONE can win the lottery, they finally get the clue that although their odds of winning are pretty much the same as before, it’s no fun to buy lottery tickets.
I’d pull the giant cellophane ‘S’ from my costume and fling it on someone so it would entangle them for a second or two, which would… um…
That really was a lame super-power, wasn’t it?
Or consider what happens if you orgasam. It could get ugly.
Well, for starters we may as well assassinate the leaders, and the network behind them, of every country on earth. Then convince people that aliens exist. I think some flying saucers and giant beams of light should do the trick.
Once those two tasks have been accomplished and it’s widely accepted that aliens killed the leaders of every country on earth…start outing people as aliens. Come up with a way of telling aliens from humans…perhaps, when tortured, aliens cause the temperature in the room to drop. Then fly around and randomly freeze the torture chambers that would assuredly be setup to determine who was an alien.
Oh, right, and cut off all communication between countries. Can’t have people talking to each other saying that their aliens aren’t freezing rooms…
I would alternately use my heat vision to melt the ice caps and my cold breath to re-freeze them every so often, just confuse everyone on the climate change issue. I’d also chill the water around Hawaii for a few weeks straight to ruin the vacations of many many tourists.
I’m not sure, but it would involve Asian women and a lot of sex.
I like how you think!
I’d fly alongside big commercial jetliners, maybe dance on the wings or cling to the sides and peek into windows, and then disappear up top or down below just as the person or people I was tormenting had convinced someone else to look outside.
I’d pick cars up off the interstate and carry them hundreds of miles away. Maybe onto a road, maybe not.
I’d persistently buzz Area 51 and any other secret bases I could find, and then play hide-and-seek with the pilots scrambled to take me down. Preferably while carrying radio equipment to jam all frequencies they use with “No More Tears” or “Crazy Train” or “Magic Carpet Ride”. That isn’t “good” so much as “nihilistic and misdirected”. I think it qualifies as superdickery.
I’d get sushi and not pay.
I’d pants the Pope. Not sure how that adds up.
I’d use Kryptonian superspeed to move so fast as to be invisible, and use it to humiliate and harass people I don’t like. Like goosing Bush during the State of the Union; “My fellow AmeriEEEK ! !” Or follow him around for days, zipping in and out too fast to see, slapping and poking him with each pass; making sure he’s in public when I start. Speed-invisibly stripping Donald Trump naked and painting him purple while he’s in public, with camera toting reporters in sight.
I’d make politicians’ trousers fall down every time they said “I cannot recall” or similarly evasive non-responses.
I would manufacture exact duplicates of a number of famous monuments, and install them right next to the originals so that no-one could tell which was the original and which was the copy.
If I wanted to be really ostentatious, I’d pull this stunt with the Great Wall of China.
I’d make a giant inflatable model of the Moon and fly it slowly towards the Earth, so it looked like the Moon was falling out of the sky, just so I could watch people panic.
I’d build a humungous great box out of gopher wood lined with pitch, decorate the inside liberally with forty-'leven flavours of animal shit, artificially age it and bury it on the top of Mount Ararat. Then I’d leave a simulated satellite photograph with a big X marking the spot and the note “Dig Here!” on Richard Dawkins’s desk.
A few more :
Assuming Classic Superman level powers, I’d start remodeling the solar system. Exchange the Moon with Titan, say. Move Venus out by Mars so that they orbit each other. Blow off Neptune’s atmosphere.
Pick up and randomly switch the holy sites of various religions; leaving messages behind that imply that a rival religion stole it. Or set them all on Mars to encourage the space program.
Using superspeed, during planting season resow every tobacco field with marijuana seeds, after heat visioning the tobacco seeds.
Throw knives at people I don’t like, at superspeed so they don’t see me. Not to hit; just so that they’ll be walking along and schwiiing ! a knife appears from nowhere in the wall next to their head.
Use heat vision to brand the word GAY on the forehead of notable homophobes. And POOR IMPULSE CONTROL on the forehead of Neal Stephenson, author of Snow Crash.
I’d use super-speed to create a persistence of vision mob (a.k.a. a real flash mob): It’s really just me, but I’m moving so quickly from position to position it looks like a million-me march. When the police are called to quell the growing unrest, nobody’s there.
I’d carve rude words into the Moon, a new one each month. In between times, I’d expose myself to the Hubble Space Telescope.
I’d cause showers of ice cubes in random cities. Maybe showers of shrimp as well.
Why - you got a thing for skeletons? :rolleyes:
Millimeter wave radar vision - now thats where it’s at. 
Si
Skirts. Updrafts with superbreath. Think Marilyn Monroe.
Nah, not Burger King.
Little chocolate donuts. The REAL breakfast of champions.
You could also wait till he is at some big formal dinner with lots of heads of state, then hit him in the stomach hard enough to make him puke.
Wait until rush hour and everyone’s streaming out of downtown buildings, fly above and dump buckets of water randomly on the people on the sidewalks, then quickly fly out of sight and watch as hilarity ensues.
Car alarm going off? Pick it up, invert, set back down.
Pick a “special friend” for the week - someone in the media who’s really annoying or buttholish. When they’re going up to a podium to speak, or walking around the corner in a hall, or even turning their head to wave to the press, zip up with super speed and slap a cream pie in their face, and zip away.
Sunglasses for the statue of liberty.
Use heat vision to give random people hot-foots on the street.
Blow out people’s birthday candles from across the room before they get a chance.
Fly alongside airplanes and flip off the pilots.
Use X-ray vision at the airport to tell the TSA staff the contents of their pockets.
A black lacy bra hanging off the top of every flagpole in the city of Indianapolis.
Go to a rail terminal or wharf and use shipping containers like leggos to build little houses and other structures.
Every sunday morning at 3:30am, drop a 2-ton rock from a height of 6000 ft onto the front lawn of Bill Gates.
Oh, I’ve got another one. I’d find an empty plot of land and build a duplicate of Rome. In a day. Just to throw off the saying.