At Startup School, there was a line of several hundred people waiting for lunch, which consisted of a dozen or so different kinds of pizza stacked in piles of 7-10 boxes each. We had a group of 3-4 people, looked at the line, and someone said, "This line is ridiculous. How can we hack this system?" Someone suggested going somewhere else on campus to eat, but we wanted to stay and mingle. Someone else in the group knew people farther up in the line, and suggested skipping ahead in the line. Ultimately, I simply squeezed through near the front of the line, grabbed a whole box of pizza, and took it back for our group to share.
This kept our group from further clogging the line and seemed much more efficient than 3-4 of us waiting to select our 1-2 pieces each. Hopefully no hungry Startup School attendees were upset by our line hackery, as we thought it was a pretty win-win hack.