If it's the ad I'm thinking of, I've seen it already and yes, it involved quite a surprise...especially if you have your sound turned up.

For those interested in watching in something other than MP4, like MPEG1, click here:
http://oxalic.net/temp/classic_auto_1.mpeg

(I'm assuming this is the same commercial as in the first post, because I'm too lazy to open VLC and watch the MP4)