An extreme case of mis- or non-applied usability practices:
A staple gun fired from the wrong end!

I don’t work in physical product manufacturing or packaging, but I’m thinking the manufacturer could have prevented this. The user didn’t read the instructions (seems quite common), but the design of the staple gun could have reinforced the correct usage through shape, colors, or warning labels.

Considering the ridiculous amount of hard work it takes to create any type of semi-permanent sculpture, I’m happy to see these examples that are strange, whimsical, and not restrained by societal censorship:
Strange Public Sculptures