I love how everyone is just so unique
I mostly think in words, as if there's a "voice" inside my head. Most of the time there's music playing as well.
But I also imagine a lot, as if there's a movie going on in my head.
Whenever there's an idle moment (traveling alone, for example), I'd unconsciously imagine esp conversations between me and other people. It's quite vivid and I could "feel" the emotions. There's image and there's sound, just like a movie clip
When I read, I vividly imagine the scene and all the emotions associated with it (especially if the book/story is very well-written). Each character would also have their own distinct voice/accent. For example, I read the first two chapters of Jane Eyre the other day... I felt the cold winter chill, vividly saw the heavy Gothic drapes, and sort of hated the texture and ambience of the red room she was locked in.