My cousin that lives in Iwakuni, Japan had one of them make its way into his apartment. He said he VERY carefully caught it in a glass jar then took it outside. He showed me a picture of it last year when he visited. The hornet was huge! I get a welt the size of a dinner plate when I've been stung by ones here in the U.S. I'd hate to think how my body would react if I got stung by a giant Japanese hornet.