'The Simpsons' has been on the air for 23 seasons, and they've done over 500 episodes. And a lot of those episodes have featured clips from Bart and Lisa's favorite TV show, 'Itchy and Scratchy'.

So someone made a montage of every single 'Itchy and Scratchy' clip and posted it on YouTube. All together, it's over 48 minutes long!

Here you go...'48 Minutes of Itchy and Scratchy':

My favorite one is at 3:45...'The Sound of Silencers'. Classic.