An oxymoron is when two contradictory terms are used together, usually for rhetorical effect – 'deafening silence', for example.
How about this instruction from Made.com about how to return a chair that just collapsed after 2 years:
No, Made, that's not as easy as possible. It's as difficult as possible. Who keeps the packing for furniture?
We’ve made our returns as easy as possible. All you'll need to do is:
1)Re-package your item (they’ll need to be in the original packaging or a suitable alternative)...