For me it's this copy of "Return of the Tiger" (a great war memoirs btw)
>Bought in 2012 in Spain
>Took back to Spain next year, fell in a pool and got severely water damaged
>middle pages fell out somehow (they're still in it but not held in at all)
>Lost it for almost 5 years at home
>Find it but it's been stored badly and is all bending
>More water damage when someone spills tea on it
Remarkably, it's still standing