When I am at an interview then coffee is a must. Or rather ... the mug is a must. When I started looking for job first I used to refuse coffee, I guess I was simply too nervous. Later on I found out that beeing the introvert I am I actually need the mug to hide behind. This may sound silly at first, but I don't have to worry what do I do with my hands since I hold the mug, if I need time to think about something I can sip the coffee to look occupied, and all in all I just feel safer.
Always code as if the guy who ends up maintaining your code
will be a violent psychopath who knows where you live.
-- Rick Osborne
Edit by castaway: Closed small tag in signature