A young man walks through the forest.
He comes to a bridge.
In front of the bridge is a large man carrying an axe.
The man says, "If you want to cross this bridge, you must tell me something. If I think your statement is true, I will strangle you to death. If I think your statement is false, I will chop off your head."
A few minutes later, the young man walks over the bridge, while the larger man stands pondering.
What did he say?