Examples and things to get you started:
~8 skills that are simply unproductive~
Devouring non-fiction books without taking notes.
Speed reading a useless book.
Memorizing information you can easily look up.
Binge-watching Netflix for hours.
Binge-reading Medium articles without taking action.
Mastering menus when you can use keyboard shortcuts.
Anything that fits into the question works, but keep it appropriate.
#1
I can do a lot of stuff with my feet... but I guess it would be usefull if I lost my arms...
1point