Am I describing Matango? (possible spoilers)
A long time ago I saw a movie that may be this one. There may be spoilers in my description. I am sorry I do not know how to block out the spoilers.
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The movie I rememeber was in black and white and about a group of people eating something on an island that changed them. I was thinking mushrooms but do not remember for certain. The story showed one man who "escaped" but was telling a group of people (authorities?)about what happened. I thought he either went back or was talking about going back at the end of the movie. I thought there was a line abouth him eating the mushrooms but was not changed because he left the island? Is this Matango?