Bringing in animators, character designers, other Bessatsu Shounen Magazine manga artists and event a voice actress, the Attack on Titan anime has presented a lot of memorable end cards. However, in terms of being straight out strange, this week's might have claims on being the straight out strangest.
Decide for yourself if its leading the pack...
Episode 18 End Card Illustration by Takagi Yuna (Undead Lovers)
Also by the artist
Some past end card included..
Episode 1 Shūzō Oshimi - Flowers of Evil
Episode 5 - Satou Yuuki (Sherlock Bones)
Episode 7 - Kouhei Nagashii (Houkago Sword Club)
Episode 9 - Yoshitoki Oima (Mardock Scramble)
Episode 10 - Raiku Makoto (Animal Land, Zatch Bell)
Episode 11 - Nakamura Hikaru(Arakawa Under the Bridge, Saint Young Men)
Episode 12 - Yu Kobayashi (Voice of Sasha)
@nomnii (Emperor of the Sand People)
Episode 13.5 by tanu(Tari Tari)
Episode 14 - Yoshida Ken'ichi (Eureka Seven)
Episode 15 -Chimi chara
Episode 16 - Yuugen (Outbreak Company)
Episode 17 -ATK - mini-visual novels by Steins;Gate's Nitroplus, set to be packaged with volumes 3 and 6 of the anime