I’m a pro at airport check-ins. No liquids, no forgotten
keys in my trouser pocket. As the lady at customs told me that I have a pocketknife
in my backpack I thought she was kidding me. As she added that she didn’t mind,
but that on the way back I should put it in my suitcase I was 100% certain that
she was joking. No customs lets you enter the aircraft with a pocketknife!