Improv Everywhere is a group of agents (pranksters) based in NYC who organize missions (happenings) in public space. Their intent is to bring excitement to otherwise unexciting locales and give strangers a story they can tell for the rest of their lives.
One of the group's latest missions took place in a Best Buy store and was carried out by more than 80 agents.
The group met at Best Buy, all wearing blue polo shirts almost identical to the store's uniform where after they entered the store and began circulating.
They did not claim to work at the store, however when a customer mistook them for an employee, they did their best to help out...
Extensive documentation is available online.