─ It's just one of those things.
Said of an unpleasant happening, etc. one cannot account for or do anything to prevent:
- Now, my wife is a terrible snorer. It's just one of those things.
─ It's just the thing.
that's exactly what one wants or needs:
- Would this be suitable, madam? Yes, it's just the thing.
─ Note: The expression does not correlate in meaning with the phrase that's the thing─that's the point; that is indeed the reason:
- We've not got enough money to buy a house. That's the thing─they cost such a lot of money, don't they