Portable bathrooms or porta pottys as they are more popularly known, are often used in construction sites and large outdoor gatherings.
SBT Network Television in Brazil had a great idea and had a great time with one.
SBT’s crew placed portable bathrooms in some open places. Once someone uses it, the crew quickly set up a look-like Imperial Headquarters outside of the lavatory with hidden cameras all around. Complete with fog effects, Darth Vader and his Stormtroopers are standing outside and ready to “attack” the pranked victim as they come out of the porta potty.
In addition to the Darth Vader scene, they also used another set, an Endor scene populated by Ewoks, C-3PO, R2-D2 and Chewbacca.