The oven buzzer went off, and Kate froze the DVR, and this is what was on the screen. This image was inserted several times in an American Idol commercial that was aired in the middle of a Glee episode that played on May 10 at 8:00 pm. I stepped through the commercial with the DVR in slow motion and took some pics of the many images. The funny thing about the images was they had already appeared twice at that time, and we hadn't consciously seen them. But when you know it is there, you can see it very briefly flash.
There were other images, like the one below also embedded in the commercial. I'm not a black helicopter guy by any means, but it does seem a bit creepy to me that the commercial was using subliminal message images.
Does it work, or is it legal or ethical? I don't know, but I think I'm going to stop watching these shows. Missing them won't change my life one iota. I have a pile of good books to read, and many stories to finish.