Anyone catch that episode of 30 Rock (not sure what season, but fairly recent) where Alec Baldwin is addressing the crew, mentioning Philly. Tina Fey stands up and says something very PBR... "Philly Ruuules!" etc. Cut back to Alec Baldwin and something zooms past him. Alec Baldwin: "Did you just whip a battery at me?"
Tina Fey's from Philly (Upper Darby, to be exact, which is right next to Philly. And it's probably more Philly than Philly -- there are a lot of expats like myself in the city proper yet UD has none) so I think that might explain that.
This isn't connected, but The Best Show is the only national media outlet that has ever tackled the weirdness that is life in Philly. Even better, TBS actually shows a love of Philly (through PBR and Tom's love of the city, and that a ton of callers/fans are from Philly). It's Always Funny does to an extent (I haven't watched too much) but they've never done the accent.
However, we're innundated non-stop with movies (and about 20% of every SNL sketch) about Boston that are supposedly filled with charming dockworker types that have fun accents! I lived in Boston (Somerville, but still) for three years and met absolutely zero people in that city who spoke like that.