A head-scratcher informal countable noun
Used to describe something that is difficult to understand.
The plane disappeared, which was a really head-scratcher. Nobody could explain it.
I think we need to have more time to find a solution. It's a head-scratcher.
To punish someone or something harshly
Once something has been done, you can do nothing but face the consequences.
White lie
Act in a way that is likely to cause problems for you
Barten Holyday (1593–1661), a Church of England clergyman and poet, was the first to use the term in the early 17th century.
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.