Kill All The Lawyers

Doctor Odd’s wealth comes from a series of patents he’s licensed the rights to.
If I told you what devices he invented, you’d be amazed.
You’d also be shocked to know that such easy-to-use devices were blamed by countless fools for causing grievous injuries.
They sued Doctor Odd for millions of dollars.
Doctor Odd responded by inventing one last, simple, incredibly useful invention.
Everyone in the world ended up buying one. In fact, each person born into this world is provided with one now.
Oh, and this invention – it also kills lawyers.
(Which makes it even more useful, I suppose.)