Start a browser in private browsing, for a fresh history.
Go to youtube without logging in.
Repeatedly watch whatever video you want, then return to the front page, making note of the recommeneded videos.
Your score is the number of videos required before Family Guy stops being recommended.
Lower scores are better.
Hard Mode: Get rid of late night talk shows, movie trailers, and sports shows too.
Impossible Mode: Get rid of bullshit clickbait list videos.