Call me a simpleton, but I think this is the absolute best Halloween costume I saw this year:

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Sadly there's no attribution, though the photo's all over social media.

As awesome as that get-up is, in this day and age it of course was not the most viral. That honor goes to this mythical, Disney-appropriated character and his special mode of transportation:

As you probably recognized at the end, it was none other than Casey Neistat, and co-conspirator Jesse Wellens of the PrankvsPrank YouTube Channel, behind the costume and rig. Here's how they (well, mostly Casey) put it together:

Thinking back to the porcupine: You reckon that kid can't sit down until he gets home?