Wikipedia
SafeCatch
SafeCatch is a counter-criminal strategy invented by the FBI, to be adopted by bank tellers in the event of a robbery. The method focuses attention in the guise of good customer service and allows bank tellers to rattle robbers, who generally try to remain anonymous and may not be expecting an overwhelmingly positive reaction to their robbery attempt, thereby possibly deterring them from going further with their plan.
SafeCatch was developed by the Seattle FBI office, and has been implemented in the Seattle banking system, with staff trained in 23 banks.