Again, I'm failing to address "moments" so much as weirdnesses, but:
In the USA, pretty much any eye-drop medicine is going to be some pH balanced, mild, tear-like liquid. Some of it may have allergy-medicine in it, but in general, dropping it in your eye is pretty the same substance one gets from crying.
The first time I bought eye-drops in Japan, it turned out to be FX or ICY EYE BALL RIPPER, or something. I was pretty sure I had dropped in crazy-glue, or some caustic acid by mistake. These are not mild little things, but some form of MENTH-O-LATUM that is applied to the eyeball. I freaked out, and started charging around the room, trying to get to the sink to wash out my eyes before they could melt.
My roomie at the time told me it was supposed to feel that way. This seemed about as plausible as intentionally putting a spike through one's own hand, but he seemed to be telling the truth, so I calmed down. Then I gave the stuff to him, because he liked it.
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