Maybe I've grown too accustomed to HLLs, but the fact that user-defined + in Julia compiles down to an ADD instruction impresses me.
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It is profoundly confusing writing a debugger. You're accustomed to seeing a stacktrace as a sign that you've screwed up, but it means that your debugger is working correctly!
I can't type for toffee on a Kinesis keyboard -- I am far too accustomed to a standard layout (Alt-Backspace is particularly awkward).