Had my first beer
margarita last year, mmm mmm.
Get some frozen concentrated lime juice (right next to the orange juice in the freezer
Get a sixpack of light beer
(I use Keystone) but Corona lite works good too.
Get a liter of Tequila (it doesn't have to be great stuff but not too cheap)
Some say just fill the limejuice can with Tequila but I like more.
Mix it all together in a bucket or plastic pitcher and throw it in the freezer
Warning: It's strong stuff!