I'd be okay if it just said "usability testing". In my company that's just a part of the testing phase. But no way I'm just going to grab someone walking down the hall. I assume people are busy enough.
Is this meant to be taken literally? Fog Creek companies work remotely. How would you even physically grab someone in the hallway? As for how we do internal testing, we simply ask around on Slack and get a solid group of people to test for us before moving forward. Works out great.