If you're not a big conversationalist, it can become easy to find a lot of parties boring and isolating. For this reason, it often helps to come with a little ice-breaker to help alleviate the fact that you've been brought together with a bunch of total strangers.
This could involve a funny or interesting story, but those who are better with their hands than their mouths might make their impression with a fun little trick they've picked up.
And considering how little one woman needed to make a fairly convincing optical illusion in the full video, that little trick may not be as hard to discover as it seems.