Knee
Under the moon beneath a tree there is a hat filled with water. You stare down into the water and decide to stick your knee in it.
Feel the water splash over your knee as you stick it into this hat. It fits really well, the hat is the perfect size for your knee. Now look up at the moonlight filtering through the tree above.
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ひざ
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Suddenly, in your knee, you feel heat and a zap (ひざ)! Your knee is simultaneously burned and electrocuted by the hot water!!
Imagine the heat then the zap going through your knee. It isn't a nice heat, it's a hot heat, then BZZZT zap! Your knee was heat zapped pretty bad.