Oh God, I saw one of those in Japan outside a store at night, we came near it and I went "what the hell is that noise?", but none of my friends could hear anyth

Oh God, I saw one of those in Japan outside a store at night, we came near it and I went "what the hell is that noise?", but none of my friends could hear anything. Turned out to be the mosquito thing, which was quite effective in getting me away from that shop. I was 35 at the time and my friends were 30ish, I guess it varies by person.