I had a client that was using a random, allocated class A, and had been since the 80s. When I said "you know...these addresses belong to someone else", their I

I had a client that was using a random, allocated class A, and had been since the 80s. When I said "you know...these addresses belong to someone else", their IT director shrugged and said "no one here needs to talk to Japan". No...I never did find out why they thought 133/8 was a cool network to hijack, but I did make a ton of consulting money readdressing them when they found out that using someone else's IP addresses had bigger implications than they thought.