This is obviously not one of *my* mishaps, but this hand from the 2012 Spingold is a mishap for the ages:
East obviously needed to pass.
But more importantly, doubles that show points are very useful when your opponents open light and do fake bidding with weak hands. Note also that it was West's support double that lined up the lucrative penalty for N-S.
I am starting to think that it is worth giving up support doubles in favor of point-showing doubles.