Difficult picture puzzle: Eye test: Can you tell which coffee mug stands out from the crowd?

Actually all the coffee cups in this picture puzzle look the same. But be careful: one of them has a processing error – and you only have 15 seconds to spot the outlier. Sounds simple? Try it yourself!

Actually all the coffee cups in this picture puzzle look the same. But be careful: one of them has a processing error – and you only have 15 seconds to spot the outlier. Sounds simple? Try it yourself!