Sources

facts:

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http://www.batman-on-film.com/historyofthebatman_thejoker_villains.html

pictures:

ttp://www.google.com/imgres?q=batman+and+two+face+together&um=1&hl=en&client=safari&rls=en&biw=800&bih=550&tbm=isch&tbnid=NT4wnlJH4zm13M:&imgrefurl=http://www.comicsreview.co.uk/nowreadthis/tag/batman/&docid=q0_vaQFzct82iM&w=250&h=381&ei=4v53ToHmLY3AtgeHsZCCDA&zoom=1&iact=hc&vpx=579&vpy=146&dur=1193&hovh=277&hovw=182&tx=105&ty=207&page=13&tbnh=186&tbnw=133&start=96&ndsp=7&ved=1t:429,r:3,s:96//

//ttp://www.google.com/imgres?q=batman+and+the+joker+together&um=1&hl=en&client=safari&rls=en&biw=1024&bih=986&tbm=isch&tbnid=Y9bltfH3K2Nd9M:&imgrefurl=http://blogs.setonhill.edu/Batman/introduction.html&docid=R_MfITP7VjY8HM&w=472&h=312&ei=qAF4TurQGomutweD17WVDA&zoom=1&iact=hc&vpx=709&vpy=692&dur=366&hovh=182&hovw=276&tx=196&ty=187&page=1&tbnh=140&tbnw=188&start=0&ndsp=23&ved=1t:429,r:22,s:0

//ttp://www.google.com/imgres?

video: http://www.youtube.com/