Here we have an unreleased clip from the 101st Family Guy episode. No one knows for sure exactly why this (nearly) 3-minute segment was cut out, but some are speculating it was because of the excessive violence and profanity.
Others say it was merely because of the stab at The Simpsons towards the end.
As ridiculous as it may seem, Fox has been known to block Family Guy clips in the past merely for having a Simpsons insult in them. Since both shows are in the same line-up, my guess is that Fox doesn’t want any decrease in The Simpsons viewership.
That being said, I haven’t personally watched The Simpsons for years. It just doesn’t have enough jokes about “Britney’s vagine” to meet my standards of quality entertainment.