Time you should wait before interjecting your opinion when walking up on two (or more) people in a conversation.
John and Fred were talking about Gun control, and Mike walked up and said that "Obama is going to take your guns away", but if he had waited 5 minutes he would have known they weren't talking about gun control at all, but how to shoot a gun. John says, "5 minute rule" and then everyone understand, he shouldn't have gotten into this conversation at this point. (And looked like an idiot).
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