He got up, staggered to the table, leaned over, looked the biggest one in the face and said: "I went by your grandma's house and I saw her in the hallway, buck naked. Man, she is fine!"
The biker looked at him and didn't say a word. His buddies were confused, because he was a bad ass, and would fight at he drop of a hat.
The drunk leaned on the table again and said: "I got it on with your grandma and she is good, the best I ever had!"
The biker still said nothing. His buddies were starting to get mad.
The drunk leaned on the table again and said: "I'll tell you something else boy, your grandma liked it!"
The biker stood up, took the drunk by the shoulder and said: "Damn it, Grandpa, you're drunk! Go home!"