Taking a break 15 or 20 minutes before actual lunch break or whatever. This is a good way to not shock your system by easing into the break time. It's a good way to piss off the boss too, so always look like you're putting things away and cleaning up for Actual Break.
It was a quarter to noon when Bud Mullins yelled out "PRE BREAK"! So we sat and relaxed to prepare for lunch.