If you've never lived thru an invasion, you're in for a surprise! Wait until you come out early in the morning and you hear their ear piercing shrills like a million high pitched jack hammers, it's frightening. Worse is when they fly right at you. I remember we were invaded a few years ago...they emerge every 17 years....and my kids and I would literally cover our heads and run for our lives to the car. They were all over the place. They hung around for 2 months or so if I recall and it was a happy day when they all croaked and all was quiet in the early morning again!
PS: I didn't have Ralphie then so I don't know how he would have reacted towards them.