Stuff mentioned already that is god-tier:
FLCL
Paranoia Agent
Ping-Pong
Stuff mentioned already that's not so good if you're older than 15:
Gurenn Lagann
Death Note
Attack On Titan
Steins:Gate
FLCL
Paranoia Agent
Ping-Pong
Stuff mentioned already that's not so good if you're older than 15:
Gurenn Lagann
Death Note
Attack On Titan
Steins:Gate