User blog comment:Bowl108/ATSD Aftermath:Phineas and Ferb Tops Friday Cable Ratings/@comment-406459-20110816035155

Actually, this list is sorted by the adult 18-49 viewership ratings, not the quality of the episode.

3.9 million is very much in the range Phineas and Ferb episodes have been getting. The fact that the 9-9:30 time slot was split between P&F and Fish Hooks made me wonder if Disney was attempting to use P&F's ratings to boost Fish Hooks (I'm not sure how well it's been doing)- if that was their plan, it succeeded, seeing as they got 3.4 million. This, combined with the fact that the new P&F was Friday night's most-watched cable outing, seems to give proof (as if any was needed) that it's a certified hit.