@IEatChawal: I like to combine danger with awkwardness by falling up stairs.
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@david8hughes: [in Walmart] "Excuse me, do you have towels?" "Oh, I don't work here." [leans in close] "I don't give a shit where you work."
@Darlainky: Establish your dominance with the drive-thru attendant by saying, "That completes my order" before they ask.