I already judged everyone.
Some classics but also dissapointed no one mentioned other classics.
Let's do this:
Spice&wolf
Black Lagoon
Hellsing
My bride is a mermaid
When they Cry (both anime I would say but I guess most popular one is better)
Steins Gate
High School of the dead (sad author died)
Sekirei
Death Note
A certain Magical Index
Is this a zombie?
Sayonara, Zetsubou-Sensei (you can't like monogatari or Arakawa under the Bridge without liking this show)
Baka and Test (couldn't be missing from this list)
Kaze no Stigma
Tenchi Muyo War on Geminar (loved tenchi muyo saga but war on Geminar was probably their best work)
Heroic Age
Dual parallel trouble adventures
Shakugan no shana
Gargantia
Maria Holic
Deadman wonderland
Buso Renkin
Another
Jormungand
Yojo Senki (the saga of tanya the evil)
Belzeebub
Magica Madoka
Shigatsu wa kimi no uso
Claymore
Chobits
Elfen Lied
No game No life
K-On!!
Angel Beats!
Psycho-pass
Heaven's memo pad
Darker than Black.
Gosick
Rozen Maiden
Ah, my Goddess!
NOTE: anyone who sees my list might think it is longer than 15 but that is only their eyes playing tricks on them. I obviously don't like anime and I obviously can't create a bigger list because I obviously haven't watched over 1.5k anime.
Edit--
If you think the list keeps getting bigger after I edit my list it is only your imagination number is still 15.
Edit after edit--
Come on... a 15 long list is impossible can it be top 200? I seriously remember new anime worthy of the list by the minute.
Edit after edit after edit--
Can it be a 500 list? Also someone stop me I can't stop adding anime. 
i seriously can't stop I love/hate whoever made this topic. 🥲
