Caution!! X Bounce!!

Caution!! X Bounce!!

Updated Jun 27, 2014 at 08:16AM EDT by mona_jpn.

Added Jun 02, 2012 at 09:49PM EDT by gi97ol.

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Caution!! X Bounce!!, known as ""What the Hell Am I Doing?" Series" (Japanese: 何やってんだ俺シリーズ, Nani Yattennda Ore Series) in Japan, refers to a series of hand-drawn animated videos of girls bounicng their breast, who are mainly from Touhou project series. Many videos related to this series are posted to the Japanese video sharing service Nico Nico Douga (NND) and YouTube.


The first instance of this series was a hand-drawn animated video uploaded to NND on July 30th, 2011 by a user roah.[1] In this video, he made Utsuho Reiuji, a big breast girl in Touhou Project, bounce her breast with her symbolic warning line “Caution!!” and the main theme song of Spelunker. The original post of this 20-second video on NND is played endlessly by auto loop feature in NND video player and had been watched over 200,000 times within its first year.

And, roah left a short comment in a description of the original post with a touch of self-derision “What the Hell Am I Doing…”.


This simple animation that was quite loyal in boy’s libido as same as X on Riding Machine and X on Treadmill inspired not few people partly due to his humorous comment. Amatuer animators soon began posting videos mimicking the style of this video, and the series of those videos were named “What the Hell Am I Doing Series” from the originator’s comment. Among those videos, one of early responses posted by Doujin illustrator Kingindo Yumeji[2] on Ausugt 2nd 2011 which set an additional character/object on bottom left, became a standard template of this series (shown below). As of May 2012, the amount of videos realted to this series on NND is about 140.[3]

Meanwhile on YouTube, this series is known as Caution!! X Bounce!! because several imported videos from NND were retitled by this phrasal template. There are a few videos made by YouTube users outside of Japan.[4]

Notable Examples

Left: Patchouli Knowledge[5] | Right: Sakuya Izayoi and Yukkuri[6]

Left: Minoriko Aki[7] | Right: Suwako Moriya[8]

Left: original character | Right: Garry's Mod version

Left: Vocaloid:Gumi’s Miku Miku Dance version | Right: Gijinka version of Octavia from MLP:FiM

Search Interest

[Not Available]

External References

Editor’s Note: Registration is needed to browse the original videos listed in this section.

[1]niconico – roah

[2]niconico – 琴吟どう 夢路

[3]niconico Douga – Search results for the tag 何やってんだ俺シリーズ

[4]YouTube – Search results for Caution Bounce

[5]niconico Douga – むきゅ / Posted on 02-02-2012

[6]niconico Douga – パドッ / Posted on 08-12-2011

[7]niconico Douga – おムネが穣子っ / Posted on 08-18-2011

[8]niconico Douga – あうぅ / Posted on 08-01-2011

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