Well, it's an old-fashioned notion.
7 seconds sound clip from the The Avengers (2012) movie soundboard.
You can hear this line at 01:30:59 in the Blu-ray version of the movie.
Quote context
[...]
- I never put all my chips on that number, though because I was playing something even riskier.
- There was an idea, Stark knows this, called the Avengers Initiative.
- To see if they could work together when we needed them to, to fight the battles that we never could.
- Phil Coulson died still believing in that idea. In heroes.
- Well, it's an old-fashioned notion.
- There's nobody around here to get hurt. You did scare the hell out of some pigeons, though.
- Lucky.
- You were awake when you fell.
[...]