
...and how DIFFICULT they can be.
The Big Bang Theory Season 8, Episode 24

- It's not DIFFICULT for me, I'm having fun.
- Leonard.
The Big Bang Theory Season 4, Episode 9

BERNADETTE: I don't know what you're doing,
but this is a very DIFFICULT time for my husband!
The Big Bang Theory Season 8, Episode 18

Maybe we did make the test too DIFFICULT.
The Big Bang Theory Season 9, Episode 8

You're making it DIFFICULT.
Game of Thrones Season 7, Episode 3