A logician is checking into the hotel he'll be staying at during a week long conference on the foundations of mathematics when he sees a small, cute dog in the corner. The dog is panting and wagging in a friendly way, and he reaches out to pet her but hesitates halfway through the motion. Looking around the nearly empty lobby, he sees a well-dressed elderly man sitting on a bench nearby. The logician asks the man, "Excuse, me, but does your dog bite?" and receives a curt headshake a single French "non" in reply. Reassured, the logician reaches out for the dog, who excited nips his finger. He quickly pulls his hand back in alarm. He turns to the man and angrily says, "Hey! This isn't your dog!"