A funny skit from John Finnemore, where a third guard is added to this old riddle:
You’re confronted with two doors. One leads to fortune, the other to death, but you don’t know which is which.
The doors are attended by two guards. One always lies, and the other always tells the truth, but again you don’t know which is which.
You can ask one question of one guard. What should you ask?
The answer, in case you’re curious, is after the jump.
Ask either guard which door the other guard would tell you is safe to take, then take the other one.