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When I was at uni, me and a friend were walking along the pavement one time carrying our skateboards, when a man and his 7yr old son came in the opposite direction. We moved aside to let them past, and the dad said that exact phrase to us.
A bit baffled, because we'd no idea what we'd done to deserve that, maybe just carry skateboards, but my mate replied with "Why, is that what you decided to do?"
You should probably preface all your posts with this.