I know I am probably being very unreasonable here. But still.
I borrowed Book 1 of a trilogy from the library. Loved it. As soon as I'd finished Book 1, I reserved Book 2. I've now finished Book 2. Also an excellent read, and from the ending of Book 2, Book 3 also looks set to be an exciting read.
Except.... I've just logged into the library website to try and reserve Book 3, and it's not in the county library stock. Which is very frustrating. And having looked at all the online Q and A's, the library will get Book 3 from another county if requested, but they'll charge me almost £14 to do so. I could buy a shiny new paperback copy of the book with change left over for that. Half the point of my library use is to stop me spending vast amounts of money on books.
I'm now (probably unreasonably) cross with the library for not buying all of the trilogy.