Usability is a four letter word. (If you can't see what is wrong with these things below, well, there's the problem.) A small sampling of proof (I have a laundry list that stretches to the moon and back, these are just off the top of my head right  now):

• I do "hg commit" and it says "abort: no username supplied (see "hg help config")" so i type "hg help config" and it says "<one thousand four hundred eighty lines of text>".
• The Android 5 SMS overlay UX seems to me to be advertising that it is a lightweight non-interrupting feature, but often when I try to use it it kind of takes forever to render and get to the point where I can reply, by which time I've probably forgotten the context anyway, so that's genius.
• If I am scrolling up as fast as I can in Android 5 Gmail, when it hits the top it bounces and reverses the scrolling at the same fast rate. So to me it looks like I am still scrolling and it will never end but in reality it is bouncing around and I am not able to get to the top and have it stop there.
• Any app (like whatever PDF reader I have set up on my Android 5 phone) with a "fast scrolling" thumb widget on the side is crap. Just like the iOS swipe-up-from-the-bottom drawer is crap. Anything that can get in the way of other normal activities -- you know, like basic scrolling, is crap.
• Most anything about Python drives me batty, it seems. Oil and water. For example.
• Requisite: blogger sucks!