Aboslutely depends on where I am, what season it is, and what activity I'm engaged in...
Guinness (virtually anytime except summer, especially because of its low alcohol content - you can drink this for a while and not end up with a lampshade on your head , also surprisingly low in calories)
Budweiser Bottles (Summer time, fishing, ONE before a long motorcycle ride, showing up at a house party in or around Cape Cod, whenever I can't find something I like, really countless other occasions)
Sam Adams Summer (Summer time)
Harpoon Summer (When it's summer, I'm in Boston, eating seafood, yelling at the Red Sox game on television with my brothers)
Red Stripe (good for cookouts because it fits into the average beer coozie)
Anchor Steam (feeling fancy!)
Samual Smith Organic Ale (feeling fancy and sustainable!)
Dirty Guera by Nimbus (feeling like supporting local brewery)
Pacifico (old reliable this close to Mexico)
Scrimshaw (with special friends...it is a very burp-y beer though)