There's a pervert on the loose in the streets of Hong Kong known as the "chest-hitting uncle". What this chest-hitting uncle does is that he bumps into unsuspecting women with his shoulder and elbow, specifically targeting their bust area. The uncle does this very nonchalantly making look like he bumped into them by accident. Yes, because you can feel SOOO much with your shoulder and elbow.
The video footage you see above is from OnTV, showing how he bumps into the unsuspecting women. The camera guy was literally tailgating the perverted uncle and the uncle didn't even notice one bit. Smile! You're on candid camera!