Wiktionary
n. (context idiomatic English) An unfortunate, but unavoidable, event.
Wikipedia
"One of Those Things" is a song co-written and recorded by the American country music artist Pam Tillis. It was released in April 1991 as the second single from the album Put Yourself in My Place. The song reached #6 on the Billboard Hot Country Singles & Tracks chart. Tillis wrote the song with Paul Overstreet.
The single was originally recorded for Warner Bros, in 1985, but was not released until Tillis recorded it for her first Arista album in 1991.
Usage examples of "one of those things".
It was one of those things Mike Stearns thought needed Ed's personal attention quite a bit more than the upcoming Rudolstadt Colloquy, if only because the administration already established by the NUS probably wouldn't appreciate being gifted with a special commission.
Diana tried to explain what it was like, but I guess ice cream is one of those things that are beyond imagination.
Thinking about it, if pretty much everyone drank and they still managed to have babies, it was probably one of those things that was only bad if the mother did too much of it.
She supposed it was one of those things that you had to put up with.
There are other things almost equally important, and Relg and Taiba are centrally involved in one of those things.
She would have to ask Bain and Chiad, and hope it was not one of those things Aiel would not talk about to wetlanders, not even wetlanders who were close friends.
But I warn you, if one of those things explodes under the wing, you'll have to walk home.
If one of those things so much as brushed against the little fishing boat's hull .