I live close to two neighbors that are Pentecostal. Both families are very nice and friendly. Some of the best neighbors I have ever had. I asked one of them a few Bible questions and just like JW's, he had some tracts to give me. I asked him about their speaking in tongues and if he has done it. He said he has and their is no feeling in the world like it. He said it is a real spiritual supernatural event. I never have seen this until looking at these videos on this thread. I believe something is truly happening from the spirit world. Personally I believe the demons could possibly be messing with them. Obviously I have no proof of that, that is only my best guess. Like JW's, they seam to be a united group of people.
I wouldn't mind going one of these days to check it out. "Test the inspired expressions".