Bosses in Japan have been flying the T-Frend drones into the offices playing 'Auld Lang Syne' - a tune used in Japan to say that a store is closing - in a bid to get their workers to finish on time.
Norihiro Kato, a director at Taisei, an office security and cleaning firm that worked on the system, said: "You can't really work when you think 'it's coming over any time now' and hear 'Auld Lang Syne' along with the buzz."
It is thought it will cost around $4,500 a month for offices to install this feature.
However, it has been met by much criticism, who says the way to reduce overtime is to reduce workloads
Scott North, professor of sociology at Osaka University, said: "Even if this robotic harassment gets workers to leave the office, they will take work home with them if they have unfinished assignments. To cut overtime hours, it is necessary to reduce workloads, either by reducing the time-wasting tasks and tournament-style competitions for which Japanese workplaces are notorious, or by hiring more workers."
Whilst Seijiro Takeshita, professor of management and information at the University of Shizuoka, added: "It's a pretty silly thing and companies are doing this just because they have to be seen to be doing something on the problem [of overtime]."