I'm all whatever about The New York Times, but I love, love, love me some MAD magazine! "Is this the end of the line?" "No, it's a freight train and I'm the caboose, you clod!" Ha! I remember learning what "Pro-Life" and "Pro-Choice" meant when I was five because of a Sergio Aragones margin cartoon in which a clever hippie has those slogans written on two different picket signs so he can pick up chicks at rallies for both sides. It's also where I first read "The Raven"-in a 1979 or 1980 "Super Special". And I think an artist's depiction of Lois Lane in "Super-Dooper Man" in that same issue gave me my thing for leggy "gal" reporters in heels.
But of course the most famous feature (and the one that ruined the mint condition of all my MADs) were artist Al Jaffee's back page fold-ins. The Times has recreated a selection of the ingenious goofs from throughout the ages. They're fully interactive (you can "fold" them online!) and they're here.