There is almost always one door to Shaffer/NEB open at all hours. This is supposedly for continuous access to the undergraduate computing lab within, but it also means that several areas in which one can sleep are reachable at all hours.
The swipecard system at the entrance to AMR II once had a single turnstyle which ignored the extant policy and allowed people with any remote access card entrance at all times. Rumor has it this was recently discovered and quashed.
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