Must Not
A wing is something you must not do anything with. Wings are fragile (think bird's wings and butterfly's wings) and sometimes dangerous (like the wings of a plane) and you must not touch them, or even go near them! You MUST NOT. You. MUST. NOT.
Imagine a pair of wings with a prohibition sign (a red circle with a red line) on them. And next time you see a wing of any kind, think "I MUST NOT"!
もち
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Apart from staying away from wings, the other thing you must not do is eat mochi (もち). Okay, they're not fragile or dangerous, but I love mochi and I don't want you eating them.
Now imagine some mochi with red prohibition circles on them. You MUST NOT eat those, do you hear me? Those mochi are mine!