Thief Knot

The Thief Knot is useful when you tie a bag of possessions closed, but
suspect someone might go into it. It looks to most people like a square knot.
When the thief re-ties it, he almost certainly will use a square knot, letting
you know someone was in your bag. 

To tie this knot, you cannot start with a simple overhand like a square knot.
Note, in the figure, that the two short ends of the knot are not on the same side,
as they would be with a square knot. The lighter-colored line is upside down,
compared to the darker-colored line. So to tie this knot, start with a simple bight
(the dark-colored line) as you would with a sheet bend. Pass the other end
(light-colored line) through the eye, around the bight, and back as shown in the
figure.  Make sure you use the reverse direction from a square knot—othewise,
it’s not a thief knot!.

My Grandfather taught me this when I was a scout; contributed by Mike Bergman

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Forty Boy Scout Knots