![One night in Bangkok
And the tough guys tumble
One night in Bangkok
And the tough guys tumble](https://content2.mcqstudy.com/ss/tbbt-3-14-00:17:38.850.jpeg)
One night in Bangkok
And the TOUGH guys tumble
The Big Bang Theory Season 3, Episode 14
![Ooh, very clever. That's a tough one.
Ooh, very clever. That's a tough one.](https://content2.mcqstudy.com/ss/tbbt-2-5-00:05:26.241.jpeg)
Ooh, very clever. That's a TOUGH one.
The Big Bang Theory Season 2, Episode 5
![Tough old beast.
Tough old beast.](https://content2.mcqstudy.com/ss/got-11-00:16:32.534.jpeg)
Tough old beast.
Game of Thrones Season 1, Episode 1
![It's getting tough for me
to be on my feet all day.
It's getting tough for me
to be on my feet all day.](https://content2.mcqstudy.com/ss/tbbt-10-10-00:10:38.555.jpeg)
It's getting TOUGH for me
to be on my feet all day.
The Big Bang Theory Season 10, Episode 10
![I know I can be tough,
but that's just 'cause
I know I can be tough,
but that's just 'cause](https://content2.mcqstudy.com/ss/tbbt-12-13-00:11:05.621.jpeg)
I know I can be TOUGH,
but that's just 'cause
The Big Bang Theory Season 12, Episode 13