Let's say that in an alternate universe, on 28 June 2009, four teenagers suddenly appears coming out from one of the faculty's bathroom stall without being recorded entering in the first place.
The first to come out is a brown-haired White Male, wearing Crimean war era British Army Uniform, complete with a revolver and cavalry saber on his hip.
Then a long-haired Male of East Asian descent, his hair done in a single braid under a cliche Manchu cap and wearing Qing dynasty-era clothes. He also carries a revolver and a dao on his hip.
Next is a blonde White Male, wearing cliche Cowboy attire, complete with two revolvers, a rifle slung at his back, and come smoking a cigarette.
And the last is a long-haired male of African descent, wearing his hair in long dreadlocks and he's decked in what is kind of recognizable as 19th century Ethiopian Army Officer's uniform. He also carries a revolver and a scimitar.
They appear to carry some sort of washed-out paper with a said printout of the invitation on top and proceed to just get into the party and start pouring themselves some champagne, before being asked by the bewildered faculty members about why they were here, which they are being quite insistent that they were time-travelers from 19th century just wanting to have some party.
Of course, they were immediately suspected to be students pulling pranks, and those guns and swords were kind of too real and make everyone else nervous... So the police are called...
And chaos ensues as the four teenagers see the officers coming, and after grabbing the booze inside their bags, immediately took off in what seems like anti-gravity packs underneath their clothes, not without bumping several people and have parts of their costumes fall off. But before they are departing, the boy wearing a British officer's uniform was heard to say to Stephen Hawking "Sorry Great-Great-Grandpa!!!" before taking off with the anti-gravity pack. The Police tries to chase after them, but the teenagers ended up breaking into the highest floor of a nearby building and being lost even as police started to encircled the building.
Before one of the supposedly normal middle-aged male faculty member (that enter as a faculty member with a faked ID) suddenly said "I'm very sorry Professor for those rascals, they were my students!" before also pulled an anti-gravity pack under his clothing and fly towards the four teenagers, much to the disbelief of everyone. Even as the middle-aged man was heard screaming something about "You just messed-up history with your prank!".
The five time-travelers were never being found again, but DNA testing of what they left (hair, flaked skin when someone inadvertently scratched them during their escape, saliva on glasses, etc) did confirm that they were human, and the boy with the British army uniform is indeed being a genetic relative of Stephen Hawking himself, that fits with his claim that Stephen Hawking is his biological great-great-grandfather.
Also the bathroom stall they are coming from, and one of the Janitor's closet in the faculty are found to have a significant scorched mark as if someone sets up a very hot thing that melted some of their parts, and at the building the time-travelers escaped into, they found one room has a large scorch mark with several types of furniture being partially burnt.
Also partially burnt remains of the invitation paper carried by the teenagers did show it is at least 120 years old using carbon dating.
So... Time travelers are real, but the first publicly recorded time-traveler contact is some teenagers pranking Stephen hawking and stealing the party booze and their marginally more subtle professor chasing after them. One of which is biologically Stephen Hawking's unborn great-great-grandson.
How would science and history from that point on evolving with such a blatant display of sci-fi tech in public?
spacebattles.com/
