Samuel Adams: Special Light Ale On Tap.
If you go to Doyle's Cafe in Jamaica Plain, you'll be able to test a Special Samuel Adams Light Ale On Tap.

This is not the same as Sam Adams Light Beer in bottles, according the the bartender at Doyles. This is a special brew that Sam Adams has delivered to Doyles as a test. They only got three barrels, so get down there if you want to have a taste.

I'll be sitting at the bar.