ahhh, but you thought it offbeat enough to actually comment about it. That's the point- it stuck in your head exactly because it was not a normal car commercial.

It'll stick in someone's head who otherwise would not have known about the HAH/HCH, and maybe pique their interest further...

Offbeat is good sometimes, when everything else is homogeneous. Doesn't have to make sense, just be mildly amusing or odd enough to be remembered.