What's the best anime episode ever made?

Not sure but here are some of my favorites off the top of my head (NO SPOILERS INCLUDED)
Katanagatari episode 4
Mob Psycho S2 episode 5
Death Note episode 7 (the ending was hilarious/godlike)

Well this didn't require any thought...

Episode 19 of Clannad ~After Story~

The latter half with Tomoya spending time with his father, only to watch him walk away perhaps one last time. Jesus. It carried the entire episode.

Evangelion episode 26 is probably one of my favorites along with The Tatami Galaxy episode 11.

Probably episode 5 of Cowboy Bebop

You know. Vicious' grand appearance, and that fight. Also, who can forget that song at the end.

Episode 5 of Haibane Renmei was slice of life, worldbuilding iyashikei goodness - yet also mysterious and somber. I'm kinda biased because I love iyashikei and mysteries and worldbuilding, but it's one of my fav episodes of anime ever.

@SpaceMajin

It's pretty funny you say Katanagatari ep 4 because I came here to say the final episode of Katanagatari

I don't know if I can pick just one so here is a whole list of them.

Episode 12 of Katanagatari

Episode 12, 23 and 24 of Steins;Gate

Episodes 126, 131, and 135 of Hunter x Hunter 2011

Episode 12 of Bakemonogatari, episode 26 of Second Season, episode 6 of Owarimonogatari and episodes 4 and 7 of Owarimonogatari S2

Ojamajo Doremi Dokkaan

Episode 49. That is all.

Naruto Shippuden ep. 365

Boruto ep. 65

*Sadly, this one doesn't speak as well for the rest of the anime

Code Geass Hangyaku no Lelouch R2
Lelouch's Death... I cried so much

Ghost in the Shell: S.A.C. 2nd GIG Episode 11

Thunderbolt Fantasy Sword Travels in the East
Episode 13. It had a totally sick fight that got pretty philosophical, and ended with a beautiful burst of salt and anger. The 'fight' after it was the cherry on top.

Bakemonogatari episode 12

Bleach
Leaning towards epsiode 361 of Bleach. I remember watching this very vividly. This episode contained the lowest of lows and the highest of highs, and a sweet throwback to early Bleach. Also, the music was ON POINT.

To summarize-- huge spoilers for the final arc:
The main character, Ichigo, was betrayed by his "friend" Ginjo, robbing him of his powers he worked so hard to attain. It felt like 360 episodes of development flushed down the toilet, although that's not very accurate. It was first time we saw Ichigo seriously break up and cry it out loud. However, members of Gotei 13, who we haven't seen in a while, come to rescue with literally the most epic entrance I can think of.

Every Fan-Service Beach episode is the best episode ever made.

Episode 10 of Violet Evergarden

Haikyuu!! 2 - Episode 24
I love Hinata's concentrated eyes. They're legendary

Re:Zero Episode 18

Was a good day for Emilia fans 😈

Yama no Susume S2, episode 17
Evangelion, episode 9
Mob Psycho 100 S2, episode 5
My Hero Academia, episode 61
Gurren Lagann, episode 27
Flip Flappers, episode 3

Others mentioned Clannad After Story ep 19 and Bakemonogatari ep 12 but no one still said Madoka Magica ep 10 though it's very popular. But I like the ending of Madoka more (ep 12). Also maybe episode 5 or 10 of Angel Beats!

There's so many great singular episodes to choose from, here are some I think are extremely good:
Made in Abyss, Episode 13
Mob Psycho 100 2, Episode 11(Honestly, most of s2's episodes)
Iroduku: The World in Colors, Episode 1
The Promised Neverland, Episode 12
Violet Evergarden, Episode 10
From the New World, Episode 25
Zombieland Saga, Episode 1
A Place Further than the Universe, Episode 12
Hunter x Hunter, Episode 126
Golden Kamuy 2, Episode 9

Gantz:O

GantzO

yeah im cheating :p

K-ON!! episode 20
Hidamari Sketch x 365 episode 4
Madoka Magica episode 10
Space Dandy Season 2, episodes 5 and 8

I don't know the specific episodes off the top of my head but there were a few in Cowboy Bebop that absolutely left me speechless. Also the Ainu-themed episode in Samurai Champloo.

@drunklemon name yours!

Impossible chose one, every anime have a best episode
Kinos Journey
episode 12
Serial Experiments Lain
last episode
Last Exile
last episode
Samurai Champloo
episode 15
xxxHOLiC
episode 2
Neon Genesis Evangelion
episode 25
MUSHISHI
episode 8
Monster
episode 14
Hyouka
episode 5
Death Note
last episode
Eden of The East
last episode
Welcome to the NHK
last episode

Every Haruhi Episode

Cocotama 1-195 (movie counted)

one piece when robin met her mother was the best for me i literally cried watching that part!
she tried soo hard to become an Archaeologist so her mother will accept her. but when she finally met her mother her mother said that she didn't know her to protect her.. that was very moving for me. one piece always has the best episodes and always makes you wanna cry

1. Ep 24- 25 of Kenpuu Denki Berserk
2. Ep 1, Ep 23-24 of SteinsGate
3. Ep 25 of Code Geass Hangyaku no Lelouch R2
4. Ep 5 of Cowboy Bebop
5. Ep 25,25 of Shin Seiki Evangelion
6. Ep 21 of JoJo no Kimyou na Bouken Ougon no Kaze
7. Ep 8 of Death Note
8. Ep 4 of Monster
9. Ep 9 of Violet Evergarden

All the above episodes are some of the best anime episodes I have ever seen in some regard or another and also
All episodes of Gintama and its sequels

Any of the last episodes of Clannad AS or Cowboy Bebop.