Yes, in myself and others.
Before I discovered AS and related anxiety issues, I really used to send myself through hell by consuming lots of caffeine as a remedy for persistent tiredness, and then being a tense and anxious jerk to everyone I was around.
I used to have a manager at a job who was worse. She perpetually drank coffee, and would take the now-banned diet pills containing ephedrine. A total "speed-freak". Came off as the most gratingly annoying and frantic human being. Just zipping around from one thing to the next, ADD-style, and pissing everybody off in the process.
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Do you feel as if people are inherently "good", inherently "bad", or inherently "neutral"?
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Plantae/Magnoliophyta/Magnoliopsida/Fabales/Fabaceae/Mimosoideae/Acacia