I had an interesting UI failure in my car today, with the knob that directs air to the windshield, middle and feet levels, with many intermediate combinations.

I had an interesting UI failure in my car today, with the knob that directs air to the windshield, middle and feet levels, with many intermediate combinations. Uncommonly, the knob can turn full circle, but it is not directional; I noticed it was turned 180° from the intended position only when I noticed I was sweating.