Fact 2: When the hall light is turned off at night and they are left to run around the hall all night, they crap everywhere. metalrabbit thinks this is because it is actually too dark for them and they can't find the cage and thus go where they can.
Fact 3: Over the past few mornings, their behaviour has grown worse and worse as the time to return them to their cage approaches. This morning at seven I went to the look and the place was all clean and tidy, when I got back up at 8:15 they had seemingly planted some sort of bomb in the sawdust in their litter tray and when I tried picking friend up to return her to the cage she peed on my hand and leg.
I suspect they're trying to tell me that they've formed a union.