A friend of mine calls any situation where the space between your ears stops working a "helmet fire." I love that expression; it's so descriptive of the times when we just stop thinking about the exterior world or "reality" and burn up in a mental paroxysm of self-fueled mental combustion. Every sport has it's "helmet fire" situations; pro athletes choke, skiers crash getting off the chairlift, novice climbers turn into jello and cling to the rock like terrified children, good leaders suddenly can't do a 5.8 move on a jug. Helmet fires, each and every one.
I've had my share (shudder)