Accidentally
The leader, Master Splinter (the rat from Ninja Turtles) isn't even supposed to exist. He exists because someone accidentally poured ooze on him.
Imagine someone accidentally spilling ooze on a rat, then watch the rat turn into a sentient rat martial artist.
ぐう
たま
None
But really, if you do something accidentally, it's probably a good (ぐう) thing in a way. You learn a bit about how you can improve yourself so you don't do it again, or in Splinter's case, it's just a good mistake!
However you look at it, try to make this accident be a good accident.