Not too long ago I went on an international trip with no documents whatsoever...

It was a beautiful Saturday, so I got on my bike in the morning and started riding. Around 50km later it was lunchtime and I reached the border so I decided to ride over for some cheap food.

On the way back I amused myself by watching the customs guys pull over every car checking to make sure that they are not bringing over too many cheap groceries from Germany.

Yay Schengen.

I have also been on an international flight with no document apart from my driving license because I forget them at home.