Boil
If a tsunami hits a dollar the water will instantly start to boil!
Imagine standing in front of an incoming tsunami. Suddenly in the distance you see someone throwing dollar bills into it and it starts to boil. Ahh!
ふつ
わ
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The boiling water crashes onto the land and you realize your foot is in it! No, not one foot, both your foots (ふつ)! It hurts so much that you can't even remember the word for two foots.
Feel your poor little foots burn in the boiling water. You really want to know who that jerk was that threw dollars into the tsunami to make it boil!