There are a couple of stories in assorted "crash comics", where blocked fuel tank vents have scrunched up the fuel bladder and pulled the metal fuel drain cock out of the bladder on Bonanzas. The fuel drain cock snares on the wing skin.
This instantly fixes the vent problem, but then lets all the fuel out under the wing, where you don't notice it escaping.
Pretty sure it did not end well on a couple of occassions.