Viz is a UK humor magazine. The format mimics the children’s comics of 1970s Britain (the most famous examples being Dandy, Beano, and so on). The content is quite wide-ranging; a letters page satirizes the idiocy of newspaper letters, feature articles spoof our celebrity-obsessed culture, and the comic strips range from foul-mouthed lavatorial humor, through the bizarre and surreal, to barbed political satire.
From time to time they run fake ads, often as space fillers. Here are a few examples from the 1990s.
Viz is available mostly in the UK. I’ve seen it on a few international newsstands in the US, but generally you’ll need to subscribe to read it. More info at http://www.viz.co.uk/