Mr. Yuk
In the days of yore, the universal symbol for "Poison" was a skull-and-crossbones insignia. However, to many children, that symbol did not convey a sense of danger, but rather adventure (due to its connection to pirates). Countless tragedies resulted, and now the "Mr. Yuk" symbol is increasingly used. Ninja supporters frequently cite this as one reason why pirates are responsible for society's downfall.
On another note, Mr. Yuk expressed concern as to why he is not seen more often in Animutations during his sole appearance (Foo-La-La!). This may be attributed to the fact that he is not particularly well-known to those who don't regularly handle household poisons.
The preceding statement was added by an anonymous user, and is possibly a joke at the expense of Indogutsu Tenbuki. Feel free to delete it, or if you REALLY hate Tenbuki, expand upon it.