Our kitten, Frank, loves to be nice and toasty warm. Whenever I pull out the heating pad he gets excited in the hopes he'll get to snuggle into it. He also has figured out that warm air comes out of the air vents. I find him all the time laying on top of the vents when the air is off hoping to absorb some of the heat off the metal...and lately he has acquired a new talent. See below.
He straddles the vent while the heat is on. He'll stand like this for the entire time the air is blowing. Smart little rat.
(As an aside, doesn't Winston look THRILLED that Frank is hovering that close?)