Sitting quietly in the garden with a large glass of wine when a sparrow landed right on the floor next to me. S/he must have sensed me and as it flew up in panic, it obviously miscalculated and flew underneath the garden table knocking itself out 
It was still alive cos I could see it breathing so I put some gardening gloves on and put it on top of the table. Its starting to stir but I'm watching it to make sure next doors cat doesn't have an extra dinner.