"Extroverts want us to have fun, because they assume we want what they want. And sometimes we do. But "fun" itself is a "bright" word, the kind of word that comes with flashing lights and an exclamation point! One of Merriam-Webster's definitions of "fun" is "violent or excited activity or argument." The very word makes me want to sit in a dimly lit room with lots of pillows-by myself."