I have the closed caption set on my TV. Not that I have difficult hearing things, but I find it helps with comprehension of some dialog.
One thing I noticed with the opening of Family Guy Stewie sings "laugh & cry" on the network broadcast, but on some of the cable reruns it has it as "effin' cry" which is more in his character.
Also on South Park, when Kenny mumbles, his dialog is still displayed so now you can understand what he's talking about.
Some of the bleeped words on some shows, even non-animated, are shown in full glory in the subtitles & visa-versa.
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"... when you're good and crazy, oooh, oooh, oooh, the sky is the limit."
"Because in this business reality can be *pretty* hard to come by."
- the Tick