I was just walking by my mantis aquarium and noticed one of them escaped when I fed them- he was hanging out on the lid of the container. I tried to get him to climb on my finger but he wasn't having any part of it. All of a sudden- he "played dead" and went completely limp. I was completely shocked by what I saw so I gently picked him up by one of his back legs and he continued to hang limp. Then as I was dropping him back in the aquarium- he came back to life just like normal. It was so strange!