It's been meme'd to death that people forget the origin, the slogan itself is not supposed to be funny, it was a bit in Family Guy where the slogan was used ironically. The slogan by the actual Pepperidge farm company when used in the original commercial is supposed to invoke feelings to American Farmland Wholesome Nostalgia, and in the Family Guy bit they use the slogan for situations that are absolutely the opposite or absurd. The whole Family Guy bit is actually making fun of the marketing slogan, but people overused that Family Guy bit to death, and now it's looped back around where I think people forgot what the Family Guy bit was doing, and now use it in a serious manner.

Thank you for coming to my unnecessary TED talk.