Turning a bolt with another bolt. Not exactly life-changing usefulness here, but still clever, and self-referentiality is very internet-trendy right now. I guess the implication of the GIF is that a correctly-sized wrench is unavailable, but a perfectly-sized bolt is not?
If the wrench used here actually were the correct size to turn the initial bolt, this would be a perfect internet DIY parody.
Reminds me of this drill bit sharpening trick:
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