The Mrs. won a trip down to Seattle for a few days. We decided to take the kids along , as childcare wasn't a convenient option. Amongst all of the hassles involved in getting everyone out of the house on time, I dropped a passport-sized/coloured booklet in my pocket, so that I'd have my passport ready to enter the USA. Show up at the pre-boarding Customs/immigration screening, and out of my pocket comes .... my pilot's licence

Compare that to the return to Canada, where the guy did notice, and bombarded me with numerous questions about my identity, work location/nature and home ...