What's In The Crate?

In the darkness behind her, a door opened; heavy footsteps approached the gagged, and blindfolded woman struggling with her bindings.
"Save your strength," a deep voice said. "You're gonna need it."
With a click! a single bulb was lit from above.
A large, locked crate could be seen behind the robed stranger; a guttural cry emanated from within.
"You're wondering what's inside the crate," he smiled, "aren't you?"
"Time to find out," he said, producing a key from within his robe.
With the lock sprung, he shut the light, and left the room.
Terrified, she heard the crate creaking open.