I've always reckoned to be OK at recognising faces and so I was relived when I got 90% on the first test. (I found the dotty pictures hard.)

But the thing that always throws me is when I meet someone out of context and I instantly recognise them, but can't for the life of me remember why I know them. The last time this happened I was walking along a local beach and I was hailed by someone I knew I knew well, but I could feel the gears crunching in my brain until thankfully I placed her as an ex-colleague from my previous job.