I've been framed!
or
It ran out of juice!
or
Because sometimes you can get rid of cancer.
or
Only one, but it sure takes a shitload of light bulbs!
or
The police had to comb the area.
or
Three skunks fighting over a pickle
First dog: My master calls me Furball. How about you?
Second Dog: My master calls me Sitboy
or
but I'd never seen herbivore [her before]
or