Wikipedia
A behrupiya or bahrupiya ( Hindustani: बहरूपिया or بہروپیا) is an impressionist in the traditional performing arts of India, Pakistan, Nepal and Bangladesh. Once popular and widespread, the art form is now in decline with most practitioners living in poverty. It was once common for behrupiyas to make a dramatic entrance at wedding or other festivities dressed as a policeman, priest, or other figure and create a commotion. The social norm surrounding these appearances was that the behrupiya usually collected no money if he was detected as an impersonator. However, if he was able to successfully convince his audience of his fake identity, he would then reveal it and be awarded a baksheesh for having entertained the group.
Due to their expertise with disguise and impersonation, good behrupiyas were recruited as spies by medieval Indian kings.