You see, I didn't realise that they were bluffing too.
4 seconds sound clip from the Ruggles of Red Gap (1935) movie soundboard.
You can hear this line at 00:05:48 in the Blu-ray version of the movie.
Quote context
[...]
- His wife took quite a fancy to you and, so they've won you.
- Do I understand that I was the stake, my lord?
- Oh, yes, yes. Rather, yes. Ha-ha. Yes.
- You see, I didn't realise that they were bluffing too.
- I had three of the eights against a flush of clubs.
- So, you really only lost by one eight.
- I do hope you don't think I didn't lose you gamely as a gentleman should.
- North America, my lord. Quite an untamed country, I understand.
[...]