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Perfection - Discovering that my retainer still fits (!) and that I have not actually neglected my dental duties to the point of negating the changes made through braces. I am grateful to no longer have fangs.

Peeve - Non-melodical whistling. What do I mean by this? People who use haphazard whistling to make themselves feel more comfortable in a foreign environment.  Even as someone well acquainted with social anxiety, I haven't yet been able to scrounge up compassion for people who do this. Seriously, just pick a song, any song!