After the recently worrying thread about 'What's the longest shot etc' I have a similar question!
What is the closest you've shot one? This is something which would impress me more than long range lunacy. I've shot several at less than 10m and recently missed a fox at about 3m! I tried to shoot it in the head and missed under its chin!
I also stalked up on a roe buck whose head was behind a tree. The wood floor was lovely cushioned moss and the wind was perfect. He was out of season but I thought I'll see how close I can get. I got right up to it and poked it in the ass with my sticks! He looked most indignant as he leapt in the air and looked back at me. Made me chuckle for ages!