Several qualify, two of the more painful:
-Put wading boots on the wrong feet, didn't discover until noon. Not entierly due to carelessness; had a pretty bad hangover that day ;> ).
-left a full box of flies open to dry on a rock near Howard Lake in the Wind Rivers. I realized that I left them about 15 miles down the trail. Needless to say, the next backpacker got lucky.
Believe me, you don't have the market cornered on "stoner" moves.
-John