Been doing some Hadoop work the last couple of days, most fun. First time I ever got cornered by some site security people for taking suspicious photographs. Apparently taking pictures of signs that say things like "large magnetic field do not enter if you have a pacemaker" is a sign of suspicious behaviour, and the local uni physics dept security people are worried about someone stealing large multi-tesla magnets and causing havoc throughout the city.
Thinking of it, having a sign "don't walk down here with a laptop with a magnetic HDD" would keep more people out, myself included