About once a quarter I stop by the bank that I often drive by and withdraw $100 in ones. I then spend a few minutes trying to convince the tellers that I'm not a strip club regular. When I get home, I stuff the stack of ones in my flight bag. The whole ordeal adds probably 10 minutes to whatever I was already doing that day.
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Thats all it takes. $100 and ten minutes of my time, every three months or so, to not be a dick.