In one sentence, describe what the following article is about:

Although it may seem that any glass will do, to enjoy a truly perfect glass of Guinness you must use a tulip glass. The shape of a tulip glass is perfect for allowing the nitrogen bubbles to circulate from the bottom and back up to the top. Although any size will do, a 16oz glass, otherwise known as a pint, is generally agreed upon as the classic size for the drink. Pour until the glass is about of the way full, in one slow smooth pour. Using the 45 degree angle keeps the Guinness from frothing and allows for a better head. Be sure to keep from pouring straight down, as it will create a fisheye in the top of the foam and large unwanted bubbles After pouring, let the Guinness set for a minute or two so the head can develop. The nitrogen bubbles become distressed by the movement of the pour, and will gather in a creamy foam at the top of the drink when allowed time to settle. Fill the glass the rest of the way up, so that a dome effect is created at the top of the glass. Although good on its own, try the beer paired with seafood for a delicious combination.

Summary:
Choose the right glass. Pour the drink into the glass at a 45 degree angle. Let the beer rest. Top the Guinness off. Enjoy your Guinness.