What is one anime everyone must watch?

Jo Jo, Death Note, Bleach, Attack on Titan. Good animes and loved by everyone.

Death note of course, snk, fma too or maybe even parasyte very good one but longest anime like one piece, naruto is shit when ur newbie

fullmetal alchemist brotherhood is the only anime I've ever watched more than once.
Elfen lied is an old classic, I remember that I loved it too.
Shiki is an anime that i remember I watched because I wanted to watch an vampire anime, and it caught me by surprise.

i have a good recommendation its called not watching anime at all cuz it SUCKS

i haven't watched anime in a long ass time, but when i did i like "Parasyte: The Maxim" & "Another". Those were p good in my opinion

Sailor Moon Crystal and Cardcaptors Clear Cards :D

Perhaps not the response you were looking for, but there's a lesser known show called Lastman that is incredibly good. It's French developed, but the animation and story fit the bill for any great anime out there.

Chuunibyou demo Koi ga shitai! Ren, Naruto Shippuden, Dragon Ball Super and Gabriel Dropout are my favorite anime shows so far!

watch shinchan it's about a little funny boy who plays tantrums on al the people around the house and outside

A very, very funny Anime is Ranma 1/2. It`s very funny & you can easly watch 1-2 episodes at one evening ^^