Strange Adsense Search Unit

has anybody seen this?

[Noximus]

Hello All,
I've found strange(maybe just for me) adsense search unit. a person on his/her site has search box which gives only adwords(natural google adwords) ads in results and also he has some links on the page like [something.com...] , and when you click on the mentioned links you get the pages with only adwords ads on it.

Do you know what is this? Is this google service or the person is doing some trick?

[Noximus]

Is not here anybody who knows what kind of ad is this?

[OptiRex]

Are you referring to the standard Google search box or the small AdLinks search box which sometimes appears on under used pages and reads something like "View ads about"?