Flail my arms around and go "What cha do that for?!" >.< And then I'd probably sit down, hug my knees, and politley listen to his life stories and how he got to be a hobo. Then, we'd be buddies and I'd call him Chili-throwing-man XD Yup, randomly throw chili at me and we'll be best buds for life >_O lol
I'd tell him what the fuck did あなた do that for あなた brute?! Then i would tell him to lay off the booze and go find a woman to fuck her to be a real man.