It isn't possible for the accounts michael.laccetti@gma.. and michaellaccetti@gma.. to belong to different users, as far as Google is concerned it's the same user.
The weeksie doppleganger is probably over on a fox news forum talking about how the communists at Google are pumping him with their liberal agenda, sending through masses of material about 'brainwashing' and 'criminal gangs' (I mean 'programming' and 'Hacker News').
According to http://mail.google.com/support/bin/answer.py?hl=en&answe... : "Gmail doesn't recognize dots as characters within usernames, you can add or remove the dots from a Gmail address without changing the actual destination address; they'll all go to your inbox, and only yours"
Ok, but how did the other michael sign up with the non-period name? That's the bug, surely?
At least, that's been the case for most of the misdirected email I've received.