As told at college
I was taught at college that a good engineer doesn't know everything but they know where to find the info they need.
Back then it meant which 3inch thick book it was in, now it means which search pattern in which engine will find it quickest.
Most solutions are found by doing the 'idiot checks' which are easier to suggest when slightly dis-inhibited by alcohol. Plus next day one can always say "You knew I'd been drinking what did you expect?"