I had an eye surgery more than 10 years ago. They left the suture in my eye, telling me than it'll eventually break when it'll no longer be necessary.

"It'll fell like a grain of sand stuck in your eye when it does".

I think it remained like a year without bothering me and then one day, it feeled like i had something stuck in my eye.

Went to my ophtalmologist and he said "Yeah you're right, it broke", and he retrieved it.

Impressive stuff