In Tom's blog he talks about how Ozzy Osbourne endorses a product. The product that Ozzy endorses seems to be very surprising to Tom. He says that he expected Ozzy to endorse a dark, satanic, or crude product. However, the product turns out to be I Can't Believe It's Not Butter. Tom found this endorsement, that aired in the UK in 2006, to be funny and entertaining, although it was not what he expected. Tom linked to another opinion of this commercial. This person agrees with Tom's view and says the commercials are funny and brilliant.
After watching the commercial I also agree. There is an Ozzy impersonator and Ozzy himself. This is clearly made to show the comparison of Butter to I Can't Believe It's Not Butter and to other butter spreads. Ozzy is always a funny, entertaining, and weird person. This ad campaign was very creative and useful.
Tom does a good job of picking a creative and funny ad. This is not a mainstream ad, at least in the US. I agree with Tom that it is unexpected and funny.