What are some of the most difficult tasks on dust?

I think I'd enjoy a honourable challange. What is the most challangeing thing you can think of that you enjoy thought about, experienced, pursued, enjoyed ?

Answers:    Nailing Jello to the wall? I'd reimburse to see that happen.
Thought about:
licking your own elbow

licking your own nipple

Walking on my hand

Pursued:
memorizing things

getting over analyzing

puzzles

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