Here are a few quick examples:
When my leg muscles are sore, sometimes they feel like they need to puke. Literally.
When I close my eyes, I don't see black. I see coloured static which coalesces into all sorts of shapes and movements. It's like my own personal cartoon show.
When I pay attention to the actual words people are saying, I see black text scrolling simultaneously with the words. Maybe that's why I've always been good at spelling. I see words when I hear them.
When I eat fresh pineapple, it makes me move my head back and my chest forward in a bizarre attempt to escape the flavour, even though I like it. I also see yellow fluid sluicing down into an invisible goblet.
Sometimes when I laugh, it's shaped like a big black wedge (like the end of one of those big pink erasers).
Now, I know these things aren't real. For instance, I don't see a literal black wedge with my laughter, but it springs unbidden in my mind, in a different fashion than if I were to intentionally imagine things to associate with sounds. And it's not like if I heard a horse whinny that I'd suddenly picture a horse. No, that makes too much logical sense. Instead, I might see a flash of yellow, simultaneous with the sound.
I suspect it's all related to my perpetual migraine status aura, but couldn't tell you for sure....