Window Cleaners
Not quite shopping but related. While in Bangkok, I saw some cleaners cleaning the glass walls of a shopping center. It was high and instead of using a gondola or similar safety products , they were rappelling down the sides of the building.
Granted it was not terribly tall like the Petronas Twin Towers but I’d never seen cleaners do that before. Pretty innovative and they were strapped in nicely so I guess it was relatively safe.