Picture of how to make a ninja mask
how to go under cover in under 60 seconds (with practice)

Step 1:

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take a t shirt and look through the head hole

Step 2:

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now take the sleeves and tie them behind ur head

Step 3:

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now make any adjustments you need to make it look better
Not bad and I have a tip:
Use a tighter shirt the you will look more like a ninja and less like a desert nomad or terrorist.
Wat did he say???