From: "Chris A. Triebel" <cat AT sun4 DOT iol DOT unh DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Laugh at my mistakes (Errors you wish you're mother told you about)
Date: Mon, 21 Oct 1996 12:26:13 -0400
Organization: University of New Hampshire  -  Durham, NH
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while(i=0)	// never enters the loop
{
	...
}

int j=SOME_NUMBER_NOT_ZERO;
while(i=j)		// perpetual look where i never really changes
{
	i++;
	...
}

Very common for me using a compiler that doesn't throw a warning about 
setting value where it suspects a comparator should be.

cat
:)