The first real full blown atheist I met was my biology teacher when I was about 11. He taught evolution and like a good JW, although I studied the subject at school, when I wrote about it I would always write 'evolutionists believe that.....blah blah blah.
He was a great guy and as I had a passion for animals and especially creepy crawlies he took a shine to me (despite me not believing in evolution) and used to let me visit his classroom after school hours to see and handle his collection of creepy crawlies, icluding giant hissing cockroaches and giant millepede and boa constrictor. For some reason I always got top marks in class... heheh