Genuphobia is an irrational fear of knees. The genuphobics may fear their own knees and/or fear seeing other people's knees. Genu comes from Latin, meaning knee. Ah, to genuflect.
Maybe you just don't like the look of knees, because they are not perfectly matched. You might have asymmetriphobia if you are afraid of asymmetrical objects, mismatched socks, mismatched earrings, etc.
No, Gelotophobia is not the fear of too much Jello. Gelotophobes have a pathological fear of being laughed at or made fun of.
Ancraophobics have an abnormal fear of wind. I made this next one up, ancrapaphobia from watching too many politicians or maybe it is crapola phobia.