hey, how's it going... I have tried researching this but can't find what I am looking for, so I hope someone can give me some insight.

Someone who is close to me has this thing that happens with their eyes. Like we could be talking, that person may start feeling frustrated or angry, and then suddenly the eyes change. What I mean by change is they are not normal anymore, they get really big like golf balls. They are aware there eyes are huge but can't control it. Personality changes suddenly too, kinda like the monster came out. This individual is usually really quiet. I have seen my share of angry people in my life, but I have only seen this eye thing with this person so I have no experience about what is going on. It is not something they are trying to do.
I can only describe it like they look possessed.

Eventually after they calm down, their eyes change back to normal.

Thanks in advance for any help