I snapped the attached photo of this humorous emergency sign right before heading into our data center last week (name hidden to protect the guilty). Then when we (tech dude Tim and I) got in, we found out that the man-trap "portal" that lets you in was broken. We spent the next couple of hours running cables and cleaning up the mess in our cage in the colo facility, then decided it was about time to head out. Which is when we found that the person we were supposed to call to get out of the data center had gone home for the day. As had most of the people in the office. We unsuccessfully tried to flag down the people streaming out the door to get some help, but finally got someone's attention, who let us out. Turns out that there is *someone* on duty till 11pm, we just didn't have their phone number.
Which I found weird. The previous colo I had experience with was at 365 Main in SF, which was very very much a 24x7 operation - our sysadmin used to spend the night down there on a regular basis. Access via the portal is 24x7 in theory, but if it's broken at 3am when someone needs to get in and there are no ($colo_facility) guys on hand... someone's going to get eaten alive.