Foot odor (or foot odour) is a type of body odor that affects the feet of humans and is generally considered to be an unpleasant smell.
https://en.wikipedia.org/wiki/Foot_odor
Concept art Smelly feet Bad knees
"You can't give up hope just because it is hopeless! You gotta hope even more, and cover your ears, and go: "Blah blah blah blah blah blah blah blah!""
Robot Leg Concept
Concept art Smelly feet Bad knees