Microexpressions can be used to annoy humans on Earth: https://www.scienceofpeople.com/microexpressions/

So, what’s annoying about microexpressions?

What I find to be more of a threat to the humans of earth are the second-hands on old electric clocks, the ones that run smoothly without ticking. For a brief second, the straight red hand and the two black hands (hour and minute hands) can form the image of a giant mosquito.