lovemylife wrote:
Don't believe in it.  Faked it when I was about 16 years old just to get the insane congregation off my back.   I certainly spent a lot of time watching and hearing others speaking in tongues and I never saw anybody derive any benefit from it, except the speaker who was of course proving how righteous they were.

I don't believe it either.  I definitely said some made-up words because I wanted so badly to speak in tongues and fit in.  In 18 years, I never experienced a trance state or anything similar.  I definitely felt emotional when singing and worshiping, but I felt like I wasn't truly spirit-filled because I thought speaking in tongues should be an overpoweringly ecstatic experience.  I remember feeling less spiritual, or less anointed, because I didn't really speak in tongues or get slain in the spirit. 

As my beliefs have changed and shifted over the years, I came up with many theories for speaking in tongues, one of them being possession by other spirits.  Now that I don't believe in evil spirits, I think speaking in tongues is basically a mix of mass-psychosis/the emperor's new clothes.