I am expressing (hopefully humorous) disbelief in the provided claims given my own experience.
As you apparently don't have relevant experience, you seem to be unable to add or subtract authenticity to the claims.
I suspect an uncharitable answer is: "One or more of our senior partners likes to accost people in the stairwells."
A more charitable explanation is that it could be a more "New York" thing in that people are at the office, drunk, late for various reasons (office parking is a good spot to park the car for late events; hit the office before riding mass transit for 30-40 minutes for a pit stop; etc.)
