I remembered something which happened a few years ago when I spent a few weeks in a clinic (getting treated for depression).
Although the "zipper down event" I am going to tell only lasted for about the first half of the day(as one stayed at the clinic from morning to afternoon and then went home for the rest of the day), it was quite nice and made my day

So I thought I would share it with you
Ok, here we go
Among the female patients was a quite cute looking girl/young woman, she was a bit chubby and her slightly protruding belly looked pretty cute although being covered by her shirt (I suppose she had gained some weight because this is a common side effect of the kind of medication used to treat depression and other mental illnesses, I observed this on myself ^^). I wanna give just one last detail information before I get to the actual "zipper down event" as I think that it will help you understand the story better

Breakfast and lunch was had at the clinic so one would arrive more or less early in the morning (around 8 am If I remember correctly) and this is where the story really starts
So, everyone was having breakfast and as people were done eating and started getting up in order to bring their dishes into the kitchen and get ready for their individual treatments, I passed the aforementioned cute chubby girl and noticed that the zipper on her jeans was completely down

I ofc enjoyed the view but also felt a bit sorry for her because of the embarrassment that's usually caused by an undone zipper. She noticed me looking at her (I probably had a quite embarassed look on my face) and realized what was going on and zipped up. When I passed her again a few minutes later, the zipper was completely down again

I looked at her (or rather her crotch ^^) again, she realized again what was going on and zipped up again. But every time I passed her again that day the zipper was completely down again, so it was obviously broken

This went on the whole time till afternoon, needless to say I enjoyed that day a lot and will never forget it
I hope you enjoyed the story as much as I enjoyed that day back then (and still enjoy the memory of it)
Cheers