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Back in the '90 I worked for a big computer co, so we had internet and USENET access, though the dodgy groups weren't available from the UK, but it didn't take much to figure out that if you proxied your USENET traffic via one of the German offices (where they were more enlightened ;-) ) then you could get everything. One of our devs did that and was amassing a lot of pr0n which he was then taking home on floppies!!!. Then one morning our manager took me to one side and said a complaint had been made by a staff member over something she "thought" she had seen on a screen, he told me he was going to instruct me to scan all the dept's workstations for pr0n the next morning and he didn't expect me (nudge nudge) to find anything unsuitable for the workplace; so after a friendly word in the dev's ear everything was wiped, I blocked access from our systems to the German proxies and told him in no uncertain terms that if he tried getting around it any other way I would find out and I would feed him to the boss, and everything blew over.