Reminds me of a patio11 post (which I haven't been able to track down) where he said he gets people signing up with a '+' but then forgetting to include the ext

Reminds me of a patio11 post (which I haven't been able to track down) where he said he gets people signing up with a '+' but then forgetting to include the extra part when they log in later. His login code accepts both versions and increments a counter to track how many people were too smart for their own good.