R2-D2 is so devoted to charity, he risked his own circuits to help out with it.
The old bucket of bolts took up the mantle in the ALS Ice Bucket Challenge, although because C-3P0 wasn’t there to translate, we don’t know who nominated him.
R2 did take some precautions, wrapping himself in a protective layer so that the water and ice didn’t do too much damage to his circuits. Based on that sound R2 makes, I don’t know if it protected him too well.
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