Mid 1990s at a solicitor
They had Netware 3, so it was an IPX network. Then there was an IPX->IP gateway, which (of course) logged website access. One of the senior partners was flagged in the logs on gay porn sites (interesting because he was married with kids), during office hours, and frequenting the subscription areas (which were paid with his company card).
We passed it up the chain as an external IT provider. The Managing Partner mentioned porn browsing (at the time she didn't know it was gay subscription whatever blah blah), and half the room went very pink and quiet, apparently.
Yeah - we use WebTitan these day - MITM for HTTPS. The cert is deployed by GPO. Fun, fun, fun...