These type videos illustrate performance anxiety and little more (though they can be funny at times).
Anyway I did this extraordinarily complicated math problem once where the instructor said anyone who did it would get an automatic 100 for the semester. I was the only one that was even close to right and I screwed up in the very last line by adding instead of subtracting in my head. I wrote it right on the next to last line, but did the simple freaking third grade arithmetic wrong in my head damn it for the final line, thereby nuking the entire proof. I was so pissed at myself.
Anyway I did this extraordinarily complicated math problem once where the instructor said anyone who did it would get an automatic 100 for the semester. I was the only one that was even close to right and I screwed up in the very last line by adding instead of subtracting in my head. I wrote it right on the next to last line, but did the simple freaking third grade arithmetic wrong in my head damn it for the final line, thereby nuking the entire proof. I was so pissed at myself.