This is simply what you think is the (not some of the, the) best example of any trope (an objective trope, not subjective, since this already is subjective). The "Crowning Example" if you will.
There could be several reasons you think an example is the best.
You think it's the best in terms of illustrating the trope.
You think it's the most well done.
It's your favorite play in that trope.
You just really like the source material.
Oh, several things before you list examples:
Each troper gets one example per trope, no more.
Don't go "no, this is," or phrases like that. This is about our own personal favorites.
Black Mesa. An enormous recreation of Half-Life, made with no sponsorship, funding or commercial backup whatsoever. It only took as long as the owner of the original franchise takes on average to release a new game, and it's widely acclaimed as the best Video Game Remake ever done, fan-made or not. And it's free.~ REV 6 Pilot
"You're the entertainer" He said in the same way someone would say "You're a motherless piece of scum and you raped my dog" "Felix Castor" I agreed, completely deadpan "I roll the blues away" ~ Metalbane
Seeing as the first one listed here is a tie, this one will be for Kyon only. ~ Zfish9
One Piece. To think this was a nice, fun, and happy series... it all went downhill when poor Luffy lost his crew, was sent to a distant island, learned his brother was going to be executed, broke into a maximum security prison, found out his brother was already gone by the time he reaches the lowest floor, ran all the way back up, went to the Marine HQ, fought the marines, and his brother still ended up giving his life to save him, causing him to go into a traumatic trance that lasted for several weeks. After learning his brother died and that it wasn't a dream, he completely breaks down and cries. Meanwhile, with Whitebeard dead, not only are islands that were formerly under his control now fighting for domination, but Blackbeard has both the Yami Yami Fruitand the Gura Gura Fruit and now declares himself the strongest pirate of this new age (At this point, it's improbable to argue). To think this was a nice, fun, and happy series... ~Metal Shadow X
The episode "The Graduates" of Kenan & Kel manages to be a triumphant example of this trope in a sitcom. ~ Not JM Keynes
Bokurano takes this to such an extreme that it's hard to imagine how it could possibly be worse. It starts with a group of middle-school children being contracted into a "game" to fight enemy mecha. First, they find out that it's not a game at all, and the giant robots are real, causing thousands of deaths from collateral damage during the battles. Then, it turns out that the robot runs on the pilot's life force, and the contract is unbreakable — so they're all going to die as a result of the battles. But if they lose even one battle, the whole universe would be destroyed. Sound hopeless enough? Oh, one more thing: the other robots are piloted by children from other Earths in the same situation, so they kill billions of people each time they win. Mohiro Kitoh is the master of this trope. ~ Enthryn
Static Shock. He was already a pretty cool and respectable superhero, but when he jumps to the future and meets his adult self...well, damn. ~ deeman45
Mikuru. She grows up, and helps Kyon fix the timeline after the incident in Vanishment. There's a point in time where there's 2 Yukis, 4 Mikurus and 3 Kyons existing at the same time, with most of them standing/lying near North High's gate.