No joke, I did a Skype call with a hiring manager at one of the big 5 and for some reason I just assumed it was an audio only deal so I took the call in only my underwear. All the guy got was me yelling a profanity and slamming the laptop close....shortest interview ever.
Don't spend time chit chatting at the beginning when it's a technical interview. I can't even count the number of candidates that ramble on forever and I can't even find a good point to politely stop them. They'll be more opportunities to show off later, folks