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The original was posted on /r/lifeprotips by /u/LocalBasket on 2025-07-22 10:04:56+00:00.
I always found myself mixing up my coffee with someone else's when making it, or swopping lunches when carrying them. That stopped when I made the decision to ALWAYS keep my stuff in my left hand, and other people's in my right hand (or on my right side) when carrying or making things.
It works for groups too: If handling multiple items/orders/meals, line them up left-to-right in order of ownership (yours always starts on the left).
Once you train yourself, you’ll never waste brainpower on "whose is whose?" again. Making two coffees? Yours goes left, theirs right. Carrying lunches? Left hand holds yours, right hand theirs.