Heard another one on 'Les Grosses Têtes' today:
On the war front, at night, a shell lands near a soldier. Succumbing to panic, the soldier flees... He runs and runs. Suddenly, in total darkness, he bumps into another person who is proudly standing there, unfazed.
"Excuse me, Sergeant."
"I'm not a Sergeant, Soldier."
"I'm not a Lieutenant either, Soldier. I'm a General."
"Really? I'm already that far from the front?"