This is a helluva way to get knocked out of contention. I talked to a teammate who interviewed someone (I'd interviewed them as well, but my area of expertise is different). He asked if they knew pthreads programming, and they said yes. He then talked to them a little about it and it became painfully obvious he had no idea what he was talking about. Be honest. Saying you know something you don't is a good way to come across as untrustworthy. Saying that "I don't know Python, but I've got some experience in other scripting languages and can probably pick it up pretty quickly" is much better. (Yes, I know nominally anyone can pick up Python quickly. It was an example.)

I call bullshit. We've been inoculating our son in accordance with the AAP's recommendations, and one of the vaccines he gets is...guess what! A polio shot!