While browsing the web tonight my wife came across what is the first enjoyable advertisement I've ever seen on the web (those fun Orbitz games don't count-- while I like to play with the baseball or putt-putt golf widgets, I didn't like the ads themselves). And the great thing about it is that it's more than just an interactive game and more than a running commercial-- it's an entertaining combination of both, almost like an example of that semi-mythical idea of "interactive TV" that pundits have written about for the last decade.
On HGTV's web site, a Flash ad showed up for Sears showing a static picture of some guy dressed up as a dandelion. Beneath him there's a button requesting that you "Roll over the weed". If you do, that's when the commercial gets hilarious.