I think I may have just now (for the first time in a blue moon).
Clue 1: No sense of loathing people around me (probably helps that there were hardly any people at the office after 5:30 today)
Clue 2: No general sense of angst about having to rush to finish something
Clue 3: No compulsive urge to check every social network known to man while procrastinating work
Possible reason 1: Very good Earl grey tea I drank
Possible reason 2: Everyone's out of the office today and it is very quiet
Possible reason 3: Doable work with realistic deadlines
Possible reason 4: This song