idle curiosity; whimsical interest; strange taste
Describes a person or their interest in something unusual, often with a nuance of eccentricity or idle curiosity. Can be used as a noun or na-adjective.
He has a strange taste and collects nothing but old clocks.
You must be a curious person to look into something like that.
There are people with eccentric tastes who have unusual hobbies.
Out of sheer curiosity, he went to a dangerous place.