I got hired for a job because I was willing to learn to program on OpenVMS. I'd never heard of it, but asked the interviewer "it's a lot like UNIX, right?". He looked at me, waited 5 or 10 seconds, and said "no." Oh well, I passed their C and SQL tests, they weren't going to let me go that easily.

I'll probably retire when they finally retire it, but at the rate they're going I may beat them to it. I won't miss it, but I won't regret it either.