Doing everything possible to fail miserably at any task after success appeared inevitable.
Snatching defeat from the jaws of victory. Being one's worst enemy. A reference to the tendency of
the Michigan State Football team to dominate 3 1/2 quarters only
to implode and give the game away to their opponent, resulting in a frustrating defeat.
Example 1: Bill overachieved
all year to get that promotion, but got fired for sending that joke about his boss to the whole company. Bill really Pulled a
Sparty.
Example 2: That girl has been into Jeff all night. I hope he doesn't Pull a Sparty and tell her about his
Dungeons and Dragons collection.