Old shows.

[Skyline]

Have you ever watched a show that you watched as a kid and just then realized all of the dirty jokes in it?

[Jupiter]

yes, haha. disney was notorious for that kinda stuff.

[Desuetude]

Yeah the Vicar of Dibley has some pretty crude jokes now I've watched it all again. Oh how oblivious and innocent every is as a child.

[Majin Vegeta]

I notice it more now with kid shows like iCarly & Victorious

[BrassMonkey]

Yeah, I will sometimes watch things I used to watch when I was little and think, "So thats what that meant!" haha

[HowlingSnail]

It's a video game, but there's this lovely echange in Jak 3:

Kleiver: (Speaking to Jak about a race) If you beat me, I'll let you keep that vehicle as long as you live.
Daxter: Oh don't worry, Jak beats things all the time.

And of course there's this at 00:42:
http://www.youtube.com/watch?v=-AkpksD9_cs

Supposedly the actress he said it to didn't actually understand until it was pointed out to her after filming. While we're at it, Power Rangers has loads: http://tvtropes.org/pmwiki/pmwiki.php/Radar/PowerRangers