HNL-ORD-YUL-EWR-HKG-ORD-YUL... one of my first mileage runs. Was feeling proud of that many hours in economy, that many timezones crossed, and very very frazzled. The poor Quebecois CBP agent couldn't make sense of my explanation that yes I was gainfully employed, and yes this was all I was traveling with, and yes this was my second time entering in as many days. Five nerve-wracking minutes later, the grunt of entry!
And all this time I'd thought the hard part of a MR was surviving the transit!