taking the fun out of something
meaning: when someone
or something turns a fun thing into something boring or terrible.
examples
James took the fun out of the game when he insisted that
everyone follow his rules.
The bad news about the car accident took the fun out of the
party.
Maria felt that keeping score took the fun out of playing
golf.
Teenagers think their parents take the fun out of
everything.
Email has taken the fun out of writing and receiving
letters.
The bill took the fun out of eating dinner at the
restaurant.