In Don Quixote, Cervantes tells of a bridge at one end of which stand a gallows and a tribunal charged with enforcing this law:
If anyone crosses by this bridge from one side to the other he shall declare on oath where he is going to and with what object; and if he swears truly, he shall be allowed to pass, but if falsely, he shall be put to death for it by hanging on the gallows erected there, without any remission.
The tribunal allows many travelers to pass freely, as it is easy to see that their declarations are truthful. But one day a man appears who swears that he has come expressly to die upon the gallows.
“It is asked of your worship, señor governor, what are the judges to do with this man?”