From the Urban Prankster group in Portugal, TodosaMarar:

Arecent mission in Lisbon was called “People are Strange”. A group of 7 agents was disguised as several characters and went to a shopping center for a walk. The reactions were amazing, especially from the kids and his parents, and from the shop employees.

After 30 minutes we get expelled from the center by the shopping security, a group of more of ten! We left calmly.

My guess is that they were inspired by this great Remi Galliard prank.