Here is one...
Gather a dice, your toothbrush and a rubber band.
Roll the dice. Even : the amount of hit with a rubber band on clitty. Uneven, the amount of stroke with your toothbrush bristles.
Then tape back the bullet vibe. On for... Roll the dice. X minutes.
Then rip off tape, and roll the dice to know if it's rubber band or toothbrush...
Repeat 5 times.
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