on *:TEXT:!Beer*:#:{ 
if ( $2 == $null ) inc %served 1 | msg $chan The Barman serves $nick an ice cold beer. I hope that fills you up! Beers Served: %Served } 
else { inc %served 1 | msg $chan The Barman serves $2 an ice cold beer. I hope that fills you up! Beers Served: %Served } 
}