There's no better way to unwind after a long day of running and platforming than to sit down and take a big whiff of your own smelly feet~ Banjo can surely attest to that :3
So, a while back when I was watching Vinesauce Vinny play Banjo Kazooie, there was a walrus that, when Banjo entered her cave she would scream out "Oh no! The mean bird and smelly bear are here!" And that instantly got my gears turning, why not make his feet really smelly, and have him enjoying it?