Question

why our pupil expand while we see something exciting or horrific
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Answer 1

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In general, the bigger the eye pupils the more favorable and excited the response. ... Not only dilated pupils show a positive response insomeone, but we also find them more appealing to look at. That's why babies are 'programmed' to dilate their eye's pupils whenlooking at adults - they get more affection points

Answer 2

Answer:

If we are aroused, our pupils dilate to take in more of our pleasing surroundings.

Often during courtship, pupils stay dilated.

You can tell when someone is aroused by looking closely at their pupils in constant, standard-level light.