I recently failed a tech interview. I was asked to pair program on a calculator.
Something so simple became more difficult under the pressure of someone watching you the entire time.
It's also nothing I've ever even thought of building nor something I would ever be asked to build in a real work environment.
I have stellar reviews from my former employers. I know I don't suck, but hell if that didn't shake me to the core.
Maybe I'm just venting.