The 10 minute "think about it" tests was the one I remember 'fondly'. You were given a scenario and had 10 minutes to come up with a plan which you were then questioned on.
Mine was a mountain rescue scenario which fortunately I had some experience in. I was pushed on my answer; "Yes, but if you do x and y you will get there 5 minutes before". "Bugger that", I said. "That involves miles of carrying a stretcher and you'll end up f*cking the rescuers and probably the casualty. Better to wait for the tide to go out and drive the casualty out".
They were impressed that I couldn't change my mind under pressure.