I had to just quickly move my car on my drive earlier today. I then turned off the ignition and took the key out, to find that the engine was still running. I put the key back in the ignition turned it forward and back again, this time the engine turned off. I tried starting the engine again, and now everything is working fine.

Any idea wtf happened? Has anyone else ever experienced this on their Focus?

Very unusual ive had it on a vw before and it was the ignition barrell was worn and needing replaced but it lasted at least a year before i had to get it done

The ignition relay switch must have stuck temporarily.

Also check your Oil level , if its low then it could be running on oil , which could be from a failing oil seals or turbo.

Just check to make sure it's not this , if you think this could be the problem do not run the car as "Engine Run away " could happen.

I hope it's not oil related :S I did check the level a couple of weeks ago, but I'll check again tomorrow (fingers crossed!).
For now I wish to believe that it was caused by what Clive said
That Diesel engine runaway sounds a bit scary, I just read up on it.

Thanks for the info guys!

I saw a runaway on a transit connect once.
WheeeeeeEEEEE BANG!

D: D: D: D: Don't scare me!

And a happy new year also