Of course, the best use is making people squirm.

There's actually quite a lot of money in making people squirm. Maybe not as much as making them wriggle, but still...

Seriously, though - congratulations. You've worked hard for this degree, and you've earned it.

As to what you can do with an MA in English - I don't think it really matters. I think it's more important to figure out what you want to do, and then see how your degree can help.