The Thief knot resembles the Reef knot at a casual
glance. Note that the ends of the Thief Knot come off opposite sides of
the knot. In the Reef knot, they come off the same sides.
However, the Thief knot has no strength whatsoever, and will slip under
tension.
Try it and see!
Tip. Only use this knot for tricks. NEVER use it where life and limb are
at risk.