If it’s your birthday this month but you think frosting is overrated, skip the cake and go right for the Maine course this year at Summer Shack in Cambridge where you can you can get a free 1-lb. lobster just for showing up. The rules are simple. Come by anytime between Wednesday the 1st through Friday the 31st, show your ID to prove you’re an October baby and they’ll hook you up with a complimentary lobster. No singing, no candles, no awkward dessert photos (unless you really want them), just pure, buttery shellfish and a snazzy plastic bib. This deal is dine-in only, and limited to one lobster per person, and yeah, you’ve still got to tip your server – but for a birthday freebie this good, it’s a no-brainer. Grab reservations here or give them a call at 617.520.9500 to save your spot.