From a tourist site about Vietnam (people are afraid that they will live in their room hexons).
Q: How to react to hexons and how can they be removed?
A: Please don’t react to hexons or harm them – they’re on our side in the fight against mosquitoes. The hexadecimals are completely harmless and themselves are very afraid of you and try not to get in the eye again. The only traces of their presence are sounds (like a strike) and snoop (practically invisible).