A Chinese bank teller has become an online sensation after she was caught on camera laughing at a dangerous armed robber. Surveillance footage shows the would-be bandit walking up to the counter, where the teller is serving another woman. Speaking on a cell phone, he holds the cleaver up to the dividing glass. The other customer quickly leaves, with the teller looking confused - and then smiling - as she turns to speak to a superior. Meanwhile, security guards approach the man - believed to be mentally ill and who, despite wielding the blade, was not acting in a particularly threatening manner - and haul him to the ground.